CN113435640B - Method for predicting in-situ EC (environmental impact) of soils with different plough layers in main growth period of rice in soda saline-alkali soil - Google Patents
Method for predicting in-situ EC (environmental impact) of soils with different plough layers in main growth period of rice in soda saline-alkali soil Download PDFInfo
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Abstract
A method for predicting in-situ EC of soil in different plough layers of main growth periods of rice in soda saline-alkali soil relates to a method for predicting indexes of soda saline-alkali soil. The method aims to solve the technical problem that the rapid and accurate acquisition of the plough layer in-situ EC in the main growth period of the rice in the soda saline-alkali soil is time-consuming and labor-consuming. The method comprises the following steps: measuring to obtain plough layer soil in-situ EC of 5cm in a seedling turning stage, a tillering stage, an elongation stage, a booting stage, a heading stage, a flowering stage and a milk stage; and secondly, substituting the numerical value obtained in the step one into an EC regression prediction equation to obtain the in-situ EC of the plough layer soil of 10cm, 15cm and 20 cm. According to the method, the in-situ EC of the plough layer soil of 10cm, 15cm and 20cm in the corresponding main growth period of the soda saline-alkali land rice field is predicted based on the in-situ EC of the plough layer soil of 5cm in the main growth period of the rice through a regression equation. The determination method is time-saving and labor-saving, and can simply, quickly, scientifically and accurately obtain the in-situ EC of the soil of different plough layers in the main growth period of the rice. Belonging to the field of prediction of soil in-situ EC of different plough layers in the rice growth period.
Description
Technical Field
The invention relates to a method for predicting indexes of soda saline-alkali soil.
Background
The Songnen plain is one of three concentrated regions of soda saline-alkali soil in the world, and the soda saline-alkali soil contains NaHCO 3 With Na 2 CO 3 Mainly has pH more than 8.5, is strong in alkalinity, has the alkalization degree of more than 70 percent, has poor physicochemical properties, large treatment difficulty, long time and slow effect. Practice proves that the development of the rice seed is an effective way for improving and utilizing the soda saline-alkali soil. The soil conductivity (EC) is an index for measuring water-soluble salt of soil and is an important reference for judging the light and heavy degree of soda saline-alkali soil. Meanwhile, the soil EC of different plough layers of the rice is an important factor for judging whether the salt ions in the soda saline-alkali soil limit the growth of the rice and influence the absorption and utilization of mineral nutrition. Therefore, monitoring of soil salinity of different plough layers of the main growth period of the rice in soda saline-alkali soil is an essential measure. For a long time, saline-alkali soil plough layer EC determination is mainly carried out by preparing soil leaching liquor after soil sampling and air drying, and with the development of technology, soil in-situ EC is counted as a portable soil salinity determination instrument and is widely applied. Before the in-situ EC meter is used for testing, the surface of a metal probe of the soil in-situ EC meter needs to be cleaned by an abrasive cloth to prevent the measurement precision from being influenced. When the method is used for measuring the soil EC of different plough layers, after the in-situ EC of soil of one plough layer depth is measured, the soil on the surface of a metal probe of the EC meter needs to be cleaned in time, and the in-situ EC of the soil of other depths is measured after the EC meter is washed by distilled water. But due toThe physicochemical property of the soil of the soda saline-alkali soil is poor, the heavily-adhered soil is adhered to the surface of the probe, the cleaning process is troublesome and labor-consuming, and the rapid and accurate acquisition of the in-situ EC of the soil of different plough layers in the main growth period of the rice in the soda saline-alkali soil has certain difficulty.
Disclosure of Invention
The invention aims to solve the technical problem that the rapid and accurate acquisition of the in-situ EC of the soil in different plough layers of the main growth period of the rice in the soda saline-alkali soil is time-consuming and labor-consuming, and provides a method for predicting the in-situ EC of the soil in different plough layers of the main growth period of the rice in the soda saline-alkali soil.
The method for predicting the EC of different plough layers in the main growth period of the rice in the soda saline-alkali soil is carried out according to the following steps:
cleaning the surface of a metal probe of a soil in-situ EC meter by using a grinding cloth, and then correcting the precision of the probe by using a standard solution of the soil in-situ EC meter;
secondly, in the rice green turning stage, tillering stage, jointing stage, booting stage, heading stage, flowering stage and milk stage of soda saline-alkali soil, vertically and clockwise inserting a metal probe of a soil in-situ EC meter into soil of a plough layer of a rice field, stopping inserting the probe into the soil with the depth of 5cm, and enabling the soil to be completely and uniformly contacted with the metal surface of the probe, wherein the response time is 10-20 seconds, and the number displayed by an instrument is the measured value of the EC of the soil of the plough layer of 5cm in the green turning stage, tillering stage, jointing stage, heading stage, flowering stage and milk stage;
and thirdly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the second step as an x value into an EC regression prediction equation (1):
Y＝-0.001x 3 +0.04x 2 +0.62x+0.681，R 2 obtaining the in-situ EC of the soil of 10cm plough layer in the green turning period as 0.965 (1);
substituting the EC measured value of the soil in the 5cm plough layer of the green turning period obtained in the step two as an x value into an EC regression prediction equation (2):
Y＝-0.001x 3 +0.033x 2 +0.700x+0.748，R 2 obtaining the in-situ EC of the soil of the 15cm plough layer in the green turning period as 0.927 (2);
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as the x value into an EC regression prediction equation (3):
Y＝-0.001x 3 +0.005x 2 +1.052x+0.324，R 2 obtaining the in-situ EC of the soil of the 20cm plough layer in the green turning period as 0.914 (3);
and fourthly, substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm at the tillering stage obtained in the second step as an x value into an EC regression prediction equation (4):
Y＝3.953E-05x 3 -0.014x 2 +1.272x-0.910，R 2 0.992(4), namely obtaining the in-situ EC of the 10cm plough layer soil in the tillering stage;
substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm obtained in the tillering stage as an x value into an EC regression prediction equation (5):
Y＝0.980x 0 . 993 ，R 2 obtaining the in-situ EC of the soil of a plough layer of 15cm at the tillering stage as 0.916 (5);
substituting the EC in-situ measurement value of the plough layer soil EC of 5cm in the tillering stage obtained in the step two as the x value into an EC regression prediction equation (6):
Y＝3.755E-05x 3 -0.013x 2 +1.191x-0.159，R 2 0.979(6), namely obtaining the in-situ EC of 20cm plough layer soil in the tillering stage;
and fifthly, substituting the measured value of the soil in-situ EC of the soil of the 5cm plough layer in the jointing stage obtained in the step two as an x value into an EC regression prediction equation (7):
Y＝0.065x 3 +0.508x 2 –0.521x+1.882，R 2 0.488(7), namely obtaining the soil in-situ EC of 10cm plough layer soil in the jointing stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the jointing stage obtained in the step two as an x value into an EC regression prediction equation (8):
Y＝-0.027x 3 +0.161x 2 +0.190x+1.916，R 2 obtaining the soil in-situ EC of 15cm plough layer soil in the jointing stage when the soil is 0.131 (8);
substituting the in-situ EC measured value of the soil of the 5cm plough layer in the jointing stage obtained in the step two into an EC regression prediction equation (9) as an x value:
Y＝0.057x 3 -0.546x 2 +2.495x-0.817，R 2 0.031(9), namely getting the soil in-situ EC of 20cm plough layer in jointing stage;
and sixthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (10):
Y＝0.005x 3 -0.135x 2 +0.853x+2.021，R 2 obtaining the in-situ EC of the soil of 10cm plough layer in the booting stage as 0.590 (10);
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (11):
Y＝2.105x 0 . 434 ，R 2 obtaining the in-situ EC of the soil in the plough layer of 15cm in the booting stage, namely 0.158 (11);
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (12):
Y＝0.314x 3 –3.076x 2 +9.856x-6.375，R 2 0.069(12), namely obtaining the soil in-situ EC of 20cm plough layer soil in the booting stage;
and seventhly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (13):
Y＝-0.196x 3 +1.500x 2 -2.897x+3.786，R 2 0.450(13), namely obtaining the in-situ EC of the plough layer soil with 10cm in the heading period;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (14):
Y＝-0.353x 3 +2.287x 2 -3.978x+4.321，R 2 obtaining the in-situ EC of the soil in the plough layer of 15cm in the heading stage when the yield is 0.188 (14);
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (15):
Y＝-0.173x 3 +0.996x 2 -0.956x+2.611，R 2 obtaining the in-situ EC of the soil of 20cm plough layer in heading period, namely 0.082 (15);
and eighthly, substituting the in-situ EC measured value of the soil of the 5cm plough layer at the flowering stage obtained in the step two into an EC regression prediction equation (16) as the x value:
Y＝1.350x 0 . 768 ，R 2 0.598(16), namely obtaining the 10cm plough layer soil in-situ EC in the flowering period;
substituting the in-situ EC measured value of the soil of 5cm plough layer of flowering phase obtained in the step two into an EC regression prediction equation (17) as an x value:
Y＝1.444x 0 . 765 ，R 2 0.433(17), namely obtaining the in-situ EC of the soil of a 15cm plough layer in the flowering period;
substituting the in-situ EC measured value of the soil of 5cm plough layer of flowering phase obtained in the step two into an EC regression prediction equation (18) as an x value:
Y＝0.156x 3 -1.511x 2 +5.330x-2.902，R 2 0.336(18), namely obtaining the in-situ EC of 20cm plough layer soil in the flowering period;
and ninthly, substituting the measured value of the soil in-situ EC of the plough layer of 5cm in the milk stage obtained in the step two as the x value into an EC regression prediction equation (19):
Y＝-0.095x 3 +0.893x 2 -1.759x+3.150，R 2 0.635(19), namely obtaining the in-situ EC of the plough layer soil with 10cm in the milk stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the milk stage obtained in the step two as an x value into an EC regression prediction equation (20):
Y＝-0.068x 3 +0.636x 2 -1.263x+3.383，R 2 0.384(20), namely obtaining the soil in-situ EC of 15cm plough layer soil in the milk stage;
substituting the in-situ EC measured value of soil of 5cm plough layer in the milk stage obtained in the step two as an x value into an EC regression prediction equation (21):
Y＝-0.117x 3 +1.028x 2 -2.344x+4.725，R 2 and (3) obtaining the in-situ EC of the soil of the 20cm plough layer in the milk stage when the yield is 0.170 (21).
According to the method, the in-situ EC of the plough layer soil of 10cm, 15cm and 20cm in the corresponding main growth period of the soda saline-alkali soil rice field can be predicted based on the in-situ EC of the plough layer soil of 5cm in the main growth period of the rice through a regression equation.
The determination method is time-saving and labor-saving, and can simply, quickly, scientifically and accurately obtain the in-situ EC of the soil of different plough layers in the main growth period of the rice.
Drawings
FIG. 1 is a correlation graph of the predicted value and the measured value of the in-situ EC of the soil of a plough layer of 10cm in the rice green turning period in the soda saline-alkali soil in the first experiment;
FIG. 2 is a correlation diagram of the predicted value and the measured value of the in-situ EC of the plough layer soil of 15cm in the rice green turning period in the soda saline-alkali soil in the first experiment;
FIG. 3 is a correlation graph of the predicted value and the measured value of the in-situ EC of the soil in the 20cm plough layer of the rice at the seedling turning stage in the soda saline-alkali soil in the first experiment;
FIG. 4 is a correlation graph of the predicted value and the measured value of the in-situ EC in the plough layer soil of 10cm at the tillering stage of rice in soda saline-alkali soil in the second experiment;
FIG. 5 is a correlation graph of the predicted value and the measured value of the in-situ EC in the plough layer soil of 10cm at the tillering stage of rice in soda saline-alkali soil in experiment II;
FIG. 6 is a graph showing correlation between predicted values and measured values of in-situ EC in plough layer soil at 10cm tillering stage of rice in soda saline-alkali soil in experiment II.
Detailed Description
The technical solution of the present invention is not limited to the embodiments listed below, and includes any combination of the embodiments.
The first embodiment is as follows: the method for predicting the in-situ EC of the soil in different plough layers of the main growth period of the rice in the soda saline-alkali soil is carried out according to the following steps:
cleaning the surface of a metal probe of a soil in-situ EC meter by using a grinding cloth, and then correcting the precision of the probe by using a standard solution of the soil in-situ EC meter;
secondly, in the rice green turning period, tillering period, heading period, booting period, heading period, flowering period and milk stage of soda saline-alkali soil, vertically and clockwise inserting a metal probe of a soil in-situ EC meter into soil on a plough layer of the rice field, stopping inserting the probe into the soil by 5cm depth to ensure that the soil is completely and uniformly contacted with the metal surface of the probe, wherein the response time is 10-20 seconds, and the number displayed by an instrument is the measured value of the in-situ EC of the soil on the plough layer of 5cm of the green turning period, tillering period, heading period, flowering period and milk stage;
performing correlation analysis on the in-situ EC of 5cm plough layer soil in the rice green turning stage, the tillering stage, the jointing stage, the booting stage, the heading stage, the flowering stage and the milk stage and the in-situ EC of 10cm plough layer soil, 15cm plough layer soil and 20cm plough layer soil in the corresponding growth stages by adopting SPSS software;
respectively constructing regression equations for the in-situ EC of 5cm plough layer soil in the rice green turning stage, the tillering stage, the jointing stage, the booting stage, the heading stage, the flowering stage and the milk stage and the in-situ EC of 10cm plough layer soil, 15cm plough layer soil and 20cm plough layer soil in the corresponding growth stages by adopting SPSS software;
and thirdly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning period obtained in the second step into an EC regression prediction equation (1) as an x value (obtained according to 834 sample measured values):
Y＝-0.001x 3 +0.04x 2 +0.62x+0.681，R 2 0.965(1), namely obtaining the in-situ EC of the 10cm plough layer soil in the green turning period;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as an x value into an EC regression prediction equation (2) (obtained according to measured values of 834 samples):
Y＝-0.001x 3 +0.033x 2 +0.700x+0.748，R 2 obtaining the in-situ EC of the soil of the 15cm plough layer in the green turning period as 0.927 (2);
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as the x value into an EC regression prediction equation (3) (obtained according to measured values of 834 samples):
Y＝-0.001x 3 +0.005x 2 +1.052x+0.324，R 2 obtaining the in-situ EC of the soil of the 20cm plough layer in the green turning period as 0.914 (3);
and fourthly, substituting the in-situ EC measured value of the soil in the plough layer of 5cm at the tillering stage obtained in the second step into an EC regression prediction equation (4) as an x value (obtained according to actual measured values of 1080 samples):
Y＝3.953E-05x 3 -0.014x 2 +1.272x-0.910，R 2 obtaining the in-situ EC of the soil of 10cm plough layer at the tillering stage as 0.992 (4);
substituting the in-situ EC measured value of the plough layer soil of 5cm in the tillering stage obtained in the step two as an x value into an EC regression prediction equation (5) (obtained according to measured values of 1080 samples):
Y＝0.980x 0 . 993 ，R 2 0.916(5), i.e. get scoreIn-situ EC of 15cm plough layer soil in a tillering stage;
substituting the 5cm plough layer soil in-situ EC measured value of the tillering stage obtained in the step two into an EC regression prediction equation (6) as an x value (obtained according to 1080 sample measured values):
Y＝3.755E-05x 3 -0.013x 2 +1.191x-0.159，R 2 0.979(6), namely obtaining the in-situ EC of 20cm plough layer soil in the tillering stage;
and fifthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the jointing stage obtained in the step two into an EC regression prediction equation (7) as an x value (obtained according to 460 sample measured values):
Y＝0.065x 3 +0.508x 2 –0.521x+1.882，R 2 obtaining the soil in-situ EC of 10cm plough layer in the jointing stage when the yield is 0.488 (7);
substituting the EC measured value of the soil in situ of the 5cm plough layer soil in the jointing stage obtained in the step two into an EC regression prediction equation (8) as an x value (obtained according to the actual measured values of 460 samples):
Y＝-0.027x 3 +0.161x 2 +0.190x+1.916，R 2 0.131(8), namely obtaining the soil in-situ EC of the plough layer of 15cm in the jointing stage;
substituting the EC measured value of the soil in situ of the 5cm plough layer soil in the jointing stage obtained in the step two into an EC regression prediction equation (9) as an x value (obtained according to the actual measured values of 460 samples):
Y＝0.057x 3 -0.546x 2 +2.495x-0.817，R 2 0.031(9), namely getting the soil in-situ EC of 20cm plough layer in jointing stage;
and sixthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (10) (obtained according to actual measured values of 320 samples):
Y＝0.005x 3 -0.135x 2 +0.853x+2.021，R 2 0.590(10), namely obtaining the soil in-situ EC of 10cm plough layer soil in the booting stage;
and (3) substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (11) (obtained according to the measured values of 320 samples):
Y＝2.105x 0 . 434 ，R 2 ＝0.158(11)，obtaining the soil in-situ EC of 15cm plough layer soil in the booting stage;
and (3) substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (12) (obtained according to the measured values of 320 samples):
Y＝0.314x 3 –3.076x 2 +9.856x-6.375，R 2 obtaining the soil in-situ EC of 20cm plough layer soil in the booting stage as 0.069 (12);
and seventhly, substituting the in-situ EC value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (13) (obtained according to measured values of 320 samples):
Y＝-0.196x 3 +1.500x 2 -2.897x+3.786，R 2 0.450(13), namely obtaining the in-situ EC of the plough layer soil with 10cm in the heading period;
substituting the in-situ EC measured value of the soil in the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (14) (obtained according to actual measured values of 320 samples):
Y＝-0.353x 3 +2.287x 2 -3.978x+4.321，R 2 obtaining the in-situ EC of the soil in the plough layer of 15cm in the heading stage when the yield is 0.188 (14);
substituting the in-situ EC measured value of the soil in the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (15) (obtained according to actual measured values of 320 samples):
Y＝-0.173x 3 +0.996x 2 -0.956x+2.611，R 2 obtaining the in-situ EC of the soil of 20cm plough layer in heading period, namely 0.082 (15);
and eighthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the flowering period obtained in the step two into an EC regression prediction equation (16) as an x value (obtained according to the measured values of 320 samples):
Y＝1.350x 0 . 768 ，R 2 0.598(16), namely obtaining the 10cm plough layer soil in-situ EC in the flowering period;
substituting the in-situ EC measured value of the soil of 5cm plough layer of the flowering phase obtained in the step two into an EC regression prediction equation (17) as an x value (obtained according to the measured values of 320 samples):
Y＝1.444x 0 . 765 ，R 2 ＝0.433(17)obtaining the 15cm plough layer soil in-situ EC in the flowering period;
substituting the in-situ EC measured value of the soil of 5cm plough layer at the flowering stage obtained in the step two into an EC regression prediction equation (18) as an x value (obtained according to the actual measured values of 320 samples):
Y＝0.156x 3 -1.511x 2 +5.330x-2.902，R 2 0.336(18), namely obtaining the in-situ EC of 20cm plough layer soil in the flowering period;
and ninthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the milk stage obtained in the step two into an EC regression prediction equation (19) as an x value (obtained according to the measured values of 250 samples):
Y＝-0.095x 3 +0.893x 2 -1.759x+3.150，R 2 0.635(19), namely obtaining the in-situ EC of the soil of a 10cm plough layer in the milk stage;
substituting the in-situ EC measured value of soil in the plough layer of 5cm in the milk stage obtained in the step two as an x value into an EC regression prediction equation (20) (obtained according to the measured values of 250 samples):
Y＝-0.068x 3 +0.636x 2 -1.263x+3.383，R 2 0.384(20), namely obtaining the soil in-situ EC of 15cm plough layer soil in the milk stage;
and (3) substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the milk stage obtained in the step two into an EC regression prediction equation (21) (obtained according to the measured values of 250 samples) as an x value:
Y＝-0.117x 3 +1.028x 2 -2.344x+4.725，R 2 and (3) obtaining the in-situ EC of the soil of the 20cm plough layer in the milk stage when the yield is 0.170 (21).
The following experiments are adopted to verify the effect of the invention:
experiment one:
in 2019, the plough layer soil of the rice green turning period in the soda saline-alkali soil of the national field surgery observation research station of the Jilin Daan farmland ecosystem is predicted.
The method for predicting different plough layers EC of the main growth period of the rice in the soda saline-alkali soil is carried out according to the following steps:
cleaning the surface of a metal probe of a soil in-situ EC meter by using a grinding cloth, and then correcting the precision of the probe by using a standard solution of the soil in-situ EC meter;
secondly, in the rice green turning period of the soda saline-alkali soil, vertically and clockwise inserting a metal probe of a soil in-situ EC meter into soil of a plough layer of a rice field, stopping inserting the probe into the soil at a depth of 5cm, and enabling the soil to be completely and uniformly contacted with the metal surface of the probe, wherein the response time is 10-20 seconds, the number displayed by an instrument is the measured value of the in-situ EC of the soil of the plough layer of 5cm in the green turning period, and the in-situ EC is 9.10, 8.94 and 9.59 mS/cm;
and thirdly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the second step as an x value into an EC regression prediction equation (1):
Y＝-0.001x 3 +0.04x 2 +0.62x+0.681，R 2 0.965(1), namely the EC of the in-situ soil of 10cm plough layer in the green turning period is 8.88 mS/cm, 8.71 mS/cm and 9.42mS/cm respectively;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as the x value into an EC regression prediction equation (2):
Y＝-0.001x 3 +0.033x 2 +0.700x+0.748，R 2 0.927(2), namely the EC of the soil in situ of the 15cm plough layer at the green turning stage is respectively 9.10, 8.93 and 9.61 mS/cm;
substituting the in-situ EC measured value of the soil of the 5cm plough layer in the green turning period obtained in the step two as an x value into an EC regression prediction equation (3):
Y＝-0.001x 3 +0.005x 2 +1.052x+0.324，R 2 and (3) obtaining the in-situ EC of the 20cm plough layer soil in the green turning stage to be 9.56, 9.41 and 9.99mS/cm respectively.
Further applying regression equation to fit measured values and predicted values of soil in situ EC of plough layer of 10cm, 15cm and 20cm in the green turning period (figure 1-figure 3), wherein the goodness of fit is R respectively 2 ＝0.981，R 2 ＝0.962，R 2 The equation is 0.952(P is less than 0.0001), which shows that the equation has statistical significance, and the method realizes the prediction of the soil in-situ EC of the plough layer soil of 10cm, 15cm and 20cm in the field green-turning period of the soda saline-alkali soil.
Experiment two:
in 2019, the tillered layer soil of the soda saline-alkali soil rice tillering stage of the national field surgery observation and research station of Daan farmland ecosystem of Jilin is predicted.
The method for predicting different plough layers EC of the main growth period of the rice in the soda saline-alkali soil is carried out according to the following steps:
cleaning the surface of a metal probe of a soil in-situ EC meter by using grinding cloth, and correcting the precision of the probe by using standard liquid of the soil in-situ EC meter;
secondly, in the tillering stage of the rice in the soda saline-alkali soil, vertically and clockwise inserting a metal probe of a soil in-situ EC meter into plough layer soil of the rice field, stopping inserting the probe into the soil for 5cm in depth, and enabling the soil to be in complete and uniform contact with the metal surface of the probe, wherein the response time is 10-20 seconds, the number displayed by an instrument is the measured value of the in-situ EC of the soil in the plough layer of 5cm in the green turning stage, and the in-situ EC is respectively 4.43, 3.53 and 2.66 mS/cm;
and thirdly, substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm at the tillering stage obtained in the second step as an x value into an EC regression prediction equation (4):
Y＝3.953E-05x 3 -0.014x 2 +1.272x-0.910，R 2 the in-situ EC of the soil of 10cm plough layer at the tillering stage is 4.45, 3.41 and 2.38mS/cm respectively as 0.992 (4);
substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm obtained in the tillering stage as an x value into an EC regression prediction equation (5):
Y＝0.980x 0 . 993 ，R 2 0.916(5), namely the in-situ EC of the plough layer soil with 15cm of tillering stage is respectively 4.30, 3.43 and 2.59 mS/cm;
substituting the in-situ EC measured value of the plough layer soil of 5cm in the tillering stage obtained in the step two as an x value into an EC regression prediction equation (6):
Y＝3.755E-05x 3 -0.013x 2 +1.191x-0.159，R 2 and (6), namely the in-situ EC of the soil in the plough layer with the tillering period of 20cm is 4.87 mS/cm, 3.38 mS/cm and 2.92mS/cm respectively.
Further applying regression equation to fit measured values and predicted values of soil in situ EC of plough layers of 10cm, 15cm and 20cm at tillering stage (figure 4-figure 6), wherein goodness of fit is R respectively 2 ＝0.992，R 2 ＝0.457，R 2 The equation is 0.989(P is less than 0.0001), which shows that the equation has statistical significance, and the method realizes the prediction of the in-situ EC of the plough layer soil of 10cm, 15cm and 20cm in the tillering stage of the paddy field of the soda saline-alkali soil.
Claims (1)
1. The method for predicting the in-situ EC of the soil in different plough layers in the main growth period of the rice in the soda saline-alkali soil is characterized by comprising the following steps of:
cleaning the surface of a metal probe of a soil in-situ EC meter by using a grinding cloth, and then correcting the precision of the probe by using a standard solution of the soil in-situ EC meter;
secondly, in the rice green turning stage, tillering stage, jointing stage, booting stage, heading stage, flowering stage and milk stage of soda saline-alkali soil, vertically and clockwise inserting a metal probe of a soil in-situ EC meter into soil of a plough layer of a rice field, stopping inserting the probe into the soil with the depth of 5cm, and enabling the soil to be completely and uniformly contacted with the metal surface of the probe, wherein the response time is 10-20 seconds, and the number displayed by an instrument is the measured value of the in-situ EC of the soil of the plough layer of 5cm in the green turning stage, tillering stage, jointing stage, heading stage, flowering stage and milk stage;
and thirdly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the second step as an x value into an EC regression prediction equation (1):
Y=-0.001 x 3 +0.04x 2 + 0.62x +0.681，R 2 =0.965 (1), namely 10cm plough layer soil EC in the green turning period is obtained;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as the x value into an EC regression prediction equation (2):
Y=-0.001 x 3 +0.033x 2 + 0.700x +0.748，R 2 =0.927 (2), namely obtaining the in-situ EC of the soil of a 15cm plough layer in the green turning period;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the green turning stage obtained in the step two as the x value into an EC regression prediction equation (3):
Y=-0.001 x 3 +0.005x 2 +1.052x +0.324，R 2 =0.914 (3), namely the in-situ EC of the soil of the 20cm plough layer in the green turning period is obtained;
and fourthly, substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm at the tillering stage obtained in the second step as an x value into an EC regression prediction equation (4):
Y= 3.953E-05 x 3 - 0.014x 2 + 1.272x - 0.910，R 2 =0.992 (4), namely obtaining the in-situ EC of 10cm plough layer soil in a tillering stage;
substituting the in-situ EC measured value of the plough layer soil with the thickness of 5cm obtained in the tillering stage as an x value into an EC regression prediction equation (5):
Y=0.980x 0.993 ，R 2 =0.916 (5), namely the in-situ EC of the soil of a plough layer of 15cm at the tillering stage is obtained;
substituting the EC measured value of the plough layer soil of 5cm in the tillering stage obtained in the step two as an x value into an EC regression prediction equation (6):
Y= 3.755E-05 x 3 - 0.013x 2 + 1.191x - 0.159，R 2 =0.979 (6), namely the in-situ EC of the soil of 20cm plough layer at the tillering stage is obtained;
and fifthly, substituting the measured value of the soil in-situ EC of the soil of the 5cm plough layer in the jointing stage obtained in the step two as an x value into an EC regression prediction equation (7):
Y= 0.065 x 3 +0.508x 2 –0.521x +1.882，R 2 =0.488 (7), namely the soil in-situ EC of 10cm plough layer in the jointing stage is obtained;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the jointing stage obtained in the step two as an x value into an EC regression prediction equation (8):
Y= -0.027 x 3 + 0.161x 2 + 0.190x + 1.916，R 2 =0.131 (8), namely the soil in-situ EC of the plough layer of 15cm in the jointing stage is obtained;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the jointing stage obtained in the step two as an x value into an EC regression prediction equation (9):
Y= 0.057x 3 -0.546x 2 +2.495x-0.817，R 2 =0.031 (9), namely the soil in-situ EC of 20cm plough layer in jointing stage;
and sixthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two as an x value into an EC regression prediction equation (10):
Y= 0.005 x 3 - 0.135x 2 + 0.853x +2.021，R 2 =0.590 (10), namely the soil in-situ EC of 10cm plough layer soil in the booting stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two into an EC regression prediction equation (11) as an x value:
Y=2.105x 0.434 ，R 2 =0.158 (11), namely the soil in-situ EC of the plough layer of 15cm at the booting stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the booting stage obtained in the step two into an EC regression prediction equation (12) as an x value:
Y= 0.314 x 3 – 3.076x 2 + 9.856x -6.375，R 2 =0.069 (12), namely the soil in-situ EC of 20cm plough layer soil in the booting stage is obtained;
and seventhly, substituting the in-situ EC measured value of the soil in the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (13):
Y= -0.196 x 3 +1.500x 2 - 2.897x +3.786，R 2 =0.450 (13), namely the 10cm plough layer soil in-situ EC in heading period is obtained;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (14):
Y= -0.353x 3 +2.287x 2 - 3.978x +4.321，R 2 =0.188 (14), namely the soil in-situ EC of a plough layer of 15cm in the heading stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the heading stage obtained in the step two as an x value into an EC regression prediction equation (15):
Y= -0.173x 3 +0.996x 2 - 0.956x +2.611，R 2 =0.082 (15), namely obtaining 20cm plough layer in-situ soil EC in heading period;
and eighthly, substituting the in-situ EC measured value of the soil of the 5cm plough layer at the flowering stage obtained in the step two into an EC regression prediction equation (16) as an x value:
Y=1.350x 0.768 ，R 2 =0.598 (16), namely the 10cm plough layer soil in-situ EC of the flowering period is obtained;
substituting the in-situ EC measured value of the soil of 5cm plough layer of flowering phase obtained in the step two into an EC regression prediction equation (17) as an x value:
Y=1.444x 0.765 ，R 2 =0.433 (17), namely the in-situ EC of the soil in the 15cm plough layer at the flowering period is obtained;
substituting the in-situ EC measured value of the soil of 5cm plough layer of the flowering phase obtained in the step two into an EC regression prediction equation (18) as an x value:
Y= 0.156x 3 -1.511x 2 +5.330x -2.902，R 2 =0.336 (18), namely the 20cm plough layer soil in-situ EC of the flowering period is obtained;
and ninthly, substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the milk stage obtained in the step two as the x value into an EC regression prediction equation (19):
Y= -0.095x 3 +0.893x 2 -1.759x +3.150，R 2 =0.635 (19), namely obtaining the soil in-situ EC of 10cm plough layer soil in the milk stage;
substituting the in-situ EC measured value of the soil of the plough layer of 5cm in the milk stage obtained in the step two as an x value into an EC regression prediction equation (20):
Y= -0.068x 3 +0.636x 2 -1.263x +3.383，R 2 =0.384 (20), namely the soil in-situ EC of 15cm plough layer soil in the milk stage is obtained;
substituting the in-situ EC measured value of soil of 5cm plough layer in the milk stage obtained in the step two as an x value into an EC regression prediction equation (21):
Y= -0.117x 3 +1.028x 2 -2.344x + 4.725，R 2 =0.170 (21), i.e. the soil in situ EC of 20cm plough layer in the milk stage, R in the above equations (1) to (21) 2 Indicating the goodness of fit.
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