CN109874620B - Accurate water management method for machine-transplanted rice in seedling stage - Google Patents
Accurate water management method for machine-transplanted rice in seedling stage Download PDFInfo
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Abstract
A method for accurately managing water in a seedling stage of machine-transplanted rice belongs to the technical field of agriculture and is suitable for various machine-transplanted rice seedlings with the leaf age of less than 3.5 during transplanting, according to the characteristics of the water demand of the machine-transplanted rice seedling stage, the types of seedling raising soil and seedling raising matrixes are divided, the volume water content index and the watering amount of the seedling raising soil and the seedling raising matrixes which are required to be watered for the rice seedlings with different leaf ages are determined, the accurate water management of the machine-transplanted rice seedling stage is realized, and machine-transplanted strong seedlings are cultivated. Compared with the conventional water management cultivated machine-transplanted seedlings, the machine-transplanted seedlings cultivated by the method have strong physiological activity, large seedling stem, more new roots after transplantation, accelerated seedling weight increase, more spikes and high setting rate, solve the problems of weak and dead seedlings, slow survival after transplantation, insufficient effective spikes and the like caused by lack of clear watering indexes in the machine-transplanted seedling cultivation process, and can effectively improve the yield of the machine-transplanted rice by 9.06-12.13%.
Description
Technical Field
The invention belongs to the technical field of agriculture, relates to an accurate moisture management method for seedling stages of mechanically transplanted rice, and particularly relates to a method for cultivating mechanically transplanted strong seedlings by determining volume water content indexes and watering amounts of seedling raising soil and seedling raising matrixes which need watering at different leaf age stages according to the types of the seedling raising soil and the seedling raising matrixes.
Background
The mechanical transplanting of rice is a rice planting mode for transplanting rice seedlings by a transplanter. Machine-transplanted rice is also called rice machine-transplanting or rice transplanting (Shenchao et al, 2014; Sunrong et al, 2014; Guochun, 2017). The rice machine transplanting changes the rice production mode of China that the loess faces back to the sky and the rice is stooped to bend back for thousands of years, relieves the heavy and bitter force of artificial rice transplanting, greatly liberates the labor productivity and greatly improves the rice production efficiency. With the economic development of China and the great change of industrial structures, a great amount of rural labor is transferred to cities, the agricultural labor is sharply reduced, and the vigorous promotion of machine-transplanted rice is an urgent task of the current rice production and is also a necessary trend of the modern agricultural development (Shuxiao swallow, 2013, Xuchenglan, 2016; Qixu, etc., 2017; Gao swallow, etc., 2018).
The cultivation of seedlings suitable for machine transplanting is an important technical link for machine transplanting of rice. The quality of the machine-transplanted rice seedlings is directly related to the yield of the machine-transplanted rice, and even determines the success or failure of the rice machine-transplanting technology (Cao Cheng et al, 2008; Luoyong et al, 2013; Zhude Feng et al, 2013; Sun Cao et al, 2014; Xuyan, 2016; Gaoyi et al, 2018). Therefore, people have carried out more researches on the seedling raising mode of the mechanical transplanting of seedlings, the preparation of seedling raising soil or seedling raising matrix, the determination of the seeding amount, the seeding period and the seeding method, the fertilizer raising, the seedling age, the seedling strengthening standard and the like and have made great progress (Cao Cheng and the like, 2008; Zhu Youlong, 2011; Wang Luo Fang, 2012; Luo Yong and the like, 2013; Wuhao and the like, 2013; Wesun Sheng, 2014; for example, Ag and the like, 2014; Yang Su Nu, 2015; Xucheng lan, 2016; Guo spring, 2017; Gao Yan and the like, 2018). The water management in the seedling stage is a key technology for cultivating robust seedlings, but the research on the influence of the water management on the quality of the seedlings needs special rain shielding facilities, the technical difficulty is high, the precision requirement is high, and a special research report related to the water management in the seedling stage of the machine-transplanted rice cannot be found at present. Therefore, in rice production, moisture management is carried out on the machine-transplanted rice in the seedling stage by mostly referring to a method of moistening and irrigating the artificially transplanted rice in the seedling stage, or the moisture management is carried out according to the appearance form of soil or plants, such as that the seedling tray soil does not turn white and water, and the seedlings do not roll leaves and water in the noon in sunny days; 1, after 1 leaf and 1 heart, the accurate water management method of the seedling stage of the machine-transplanted rice is lacked (Yanwenyu and the like, 2003; Wangxuejun, 2010; Zhu Youlong, 2011; Shu Xiaoyan, 2013; Luoyong, 2013; Liu Yong, 2013; Yanzianwu, 2015; Guoshu, 2017; Gaoyan and the like, 2018) after the early afternoon and late afternoon, the water running water is irrigated in the evening of afternoon, cannot be overdried, and does not need to be fed into the seedling chamber in shallow water, so that the seedling stage of the machine-transplanted rice is not strong and even dead seedlings are often caused; the seedlings have long seedling recovery period after transplantation, insufficient effective spike number and the like, and seriously affect the yield (Wuhao et al, 2013; Kongyuan et al, 2014; Weijunsheng, 2014; Leishui City agricultural machinery office, 2015; Qixu et al, 2017). In the research of the growth characteristics of dry-raised seedlings, Wangwei (2000) proposed the water management method of cultivating dry-raised strong seedlings by using the soil water potential index of seedbed. However, there are many differences between the cultivation of dry seedlings and the cultivation of mechanical rice transplanting, such as: (1) the method comprises the following steps of (1) generally directly sowing rice seeds for cultivating dry seedlings on a seedbed, and monitoring the soil water potential at the depth of 15-20 cm of the seedbed by using a soil water tensiometer; the rice seeds for mechanical transplanting are usually sown on seedling raising soil (nutrient soil) or a seedling raising substrate, the seedling raising soil or the seedling raising substrate is usually placed on a plastic film or in a seedling raising tray, and the thickness of the seedling raising soil or the seedling raising substrate is usually 2.5cm, so that the water potential of the seedling raising soil or the seedling raising substrate cannot be monitored by a soil moisture tensiometer; (2) the seedling age (the days from sowing to transplanting) of the dry seedling is about 30 days generally, the leaf age during transplanting is more than 5.0 generally, and the dry seedling is mostly used for manual planting or seedling throwing; the seedling age of most of the machine-transplanted rice seedlings is less than 20 days and the leaf age is less than 3.5 when the machine-transplanted rice seedlings are transplanted, except the pot seedling transplanting rice seedlings with long seedling age. Therefore, the method and the index for controlling the moisture in the seedling stage of the dry seedling cannot be used for the moisture management in the seedling stage of the machine-transplanted rice. There are also some technical standards or patents related to rice irrigation (Jiangsu province agriculture water-saving and rural water supply technology Association, 2016; Yangchang, 2010, 2013, 2015) in the past, but these standards or patents are only used for field irrigation after rice transplantation and cannot be used for water management of machine-transplanted rice seedling stage.
Disclosure of Invention
The invention aims to provide an accurate water management method for the seedling stage of the mechanically transplanted rice, which is suitable for various mechanically transplanted rice seedlings with the leaf age of less than 3.5 during transplanting, can determine the volume water content index and the watering amount of seedling soil and seedling substrate which are needed to be watered for the rice seedlings with different leaf ages according to the type of the seedling soil and the seedling substrate, can solve the problems of weak and dead seedlings, slow survival after transplanting, insufficient effective spike number and the like caused by lack of clear watering indexes in the process of mechanically transplanted rice seedling, and can effectively improve the yield of the mechanically transplanted rice.
The technical scheme of the invention is as follows: a method for accurately managing water in seedling stage of machine-transplanted rice is characterized in that: the method comprises the following steps of measuring the volume and water content of seedling raising soil and seedling raising matrix at different leaf ages of seedlings according to the type of the seedling raising soil and the seedling raising matrix, taking the volume and water content as an index of the seedlings needing watering, and determining the watering amount, wherein the method comprises the following steps:
(1) the leaf age of the seedling is less than 0.5
When the volume water content of the sandy seedling raising soil is 94-98%, the volume water content of the soil seedling raising soil is 90-94%, the volume water content of the viscous seedling raising soil is 86-90%, the volume water content of the seedling raising matrix is 88-92%, and the irrigation is 12-16 mm, which is equivalent to the irrigation of 1.2L/m2～1.6L/m2The upper limit of the water content and the watering amount of the conventional japonica rice varietyThe lower limit value of the water content and the watering amount of the hybrid indica rice variety and the indica/japonica hybrid rice variety is obtained, and the intermediate value of the water content and the watering amount of the conventional indica rice variety and the hybrid japonica rice variety is obtained; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(2) seedling leaf age of 0.5-1.5
When the volume water content of the sandy seedling raising soil is 90-94 percent, the volume water content of the soil seedling raising soil is 86-90 percent, the volume water content of the viscous seedling raising soil is 80-84 percent, the volume water content of the seedling raising matrix is 84-88 percent, and the watering is 10-14 mm, which is equivalent to the watering of 1.0L/m2～1.4L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(3) the seedling leaf age is 1.6-2.4
When the volume water content of the sandy seedling raising soil is 84-88 percent, the volume water content of the soil seedling raising soil is 82-86 percent, the volume water content of the viscous seedling raising soil is 75-79 percent, the volume water content of the seedling raising matrix is 80-84 percent, and the watering is 8-12 mm, which is equivalent to the watering of 0.8L/m2～1.2L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(4) the seedling leaf age is 2.5-3.5
When the volume water content of the sandy seedling raising soil is 80-84 percent, the volume water content of the soil seedling raising soil is 78-82 percent, the volume water content of the viscous seedling raising soil is 72-76 percent, the volume water content of the seedling raising matrix is 76-80 percent, and the watering is 6-10 mm, which is equivalent to the watering of 0.6L/m2～1.0L/m2The upper limit value of water content and watering amount is selected for conventional japonica rice variety, and the lower limit value of water content and watering amount is selected for hybrid indica rice variety and indica/japonica hybrid rice varietyTaking the intermediate value of water content and watering amount of the conventional indica rice variety and the hybrid japonica rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
The sandy seedling raising soil is seedling raising soil with the sand grain content of more than 60 percent; the viscous seedling raising soil is seedling raising soil with the content of sticky grains more than 30 percent; the soil seedling raising soil is seedling raising soil with sand content less than 60% and clay content less than 30%.
The seedling raising substrate is one of a plant ash substrate, a wormcast substrate, a decomposed straw substrate or a mixed substrate of vinasse, decomposed straw and vermiculite.
The volume water content of the seedling raising soil or the volume water content of the seedling raising substrate is measured by a soil moisture measuring instrument, and the soil moisture measuring instrument selects a soil moisture rapid measuring instrument SU-LA, SU-LB or SU-LG or a soil moisture rapid measuring instrument TRSI or TRS-II.
The amount of watering is measured with a graduated beaker or graduated cylinder.
The invention has the beneficial effects that: the method is scientific and is suitable for various machine-transplanted rice seedlings with the leaf age less than 3.5 during transplanting, and the method is based on the characteristics of the machine-transplanted rice seedling stage on the water requirement, divides the type of the seedling raising soil and the seedling raising matrix, determines the seedling raising soil required to be watered for the rice seedlings with different leaf ages and the volume water content index and watering amount of the seedling raising matrix, realizes the accurate water management of the machine-transplanted rice seedling stage, and cultivates machine-transplanted strong seedlings. Compared with the conventional water management cultivated machine-transplanted seedlings, the machine-transplanted seedlings cultivated by the method have strong physiological activity, large seedling stem, more new roots after transplantation, accelerated seedling weight increase, more spikes and high setting rate, solve the problems of weak and dead seedlings, slow survival after transplantation, insufficient effective spikes and the like caused by lack of clear watering indexes in the machine-transplanted seedling cultivation process, and can effectively improve the yield of the machine-transplanted rice by 9.06-12.13%.
Detailed Description
The invention is further illustrated by the following examples:
this scheme can be represented by table 1:
TABLE 1 accurate water management method for machine-transplanted rice in seedling stage
When the volume water content of the seedling raising soil or the volume water content of the seedling raising matrix reaches the index, watering the seedlings; the conventional japonica rice variety takes the upper limit value (large value) of the volume water content of the seedling raising soil or the volume water content of the seedling raising substrate and the watering amount, the conventional indica rice variety and the hybrid japonica rice variety take the middle value of the water content and the watering amount, and the hybrid indica rice variety and the indica/japonica hybrid rice variety take the lower limit value (small value) of the water content and the watering amount.
Measuring the volume water content of seedling raising soil or a seedling raising matrix by using a soil moisture measuring instrument at 2:00 in the afternoon every day from the beginning of one week after the rice seeds are sown to the end of transplanting, and determining whether to water according to the volume water content of the seedling raising soil or the seedling raising matrix:
1. the seedling leaf age is less than 0.5: when the volume water content of the sandy seedling raising soil is 94-98%, the volume water content of the soil seedling raising soil is 90-94%, the volume water content of the viscous seedling raising soil is 86-90%, the volume water content of the seedling raising matrix is 88-92%, and the irrigation is 12-16 mm, which is equivalent to the irrigation of 1.2L/m2～1.6L/m2The upper limit value (large value) of the water content and the watering amount is taken for the conventional nonglutinous rice variety, the lower limit value (small value) of the water content and the watering amount is taken for the hybrid nonglutinous rice variety and the indica/japonica hybrid rice variety, and the middle value of the water content and the watering amount is taken for the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
2. Seedling leaf age is 0.5-1.5: when the volume water content of the sandy seedling raising soil is 90-94 percent, the volume water content of the soil seedling raising soil is 86-90 percent, the volume water content of the viscous seedling raising soil is 80-84 percent, the volume water content of the seedling raising matrix is 84-88 percent, and the watering is 10-14 mm, which is equivalent to the watering of 1.0L/m2～1.4L/m2The upper limit value (large value) of water content and watering amount is selected for conventional nonglutinous rice variety, the lower limit value (small value) of water content and watering amount is selected for hybrid nonglutinous rice variety and indica/japonica hybrid rice variety, and conventional nonglutinous rice variety and hybrid nonglutinous rice varietyTaking the intermediate value of the water content and the watering amount; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
3. The seedling leaf age is 1.6-2.4: when the volume water content of the sandy seedling raising soil is 84-88 percent, the volume water content of the soil seedling raising soil is 82-86 percent, the volume water content of the viscous seedling raising soil is 75-79 percent, the volume water content of the seedling raising matrix is 80-84 percent, and the watering is 8-12 mm, which is equivalent to the watering of 0.8L/m2～1.2L/m2The upper limit value (large value) of the water content and the watering amount is taken for the conventional nonglutinous rice variety, the lower limit value (small value) of the water content and the watering amount is taken for the hybrid nonglutinous rice variety and the indica/japonica hybrid rice variety, and the middle value of the water content and the watering amount is taken for the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
4. The seedling leaf age is 2.5-3.5: when the volume water content of the sandy seedling raising soil is 80-84 percent, the volume water content of the soil seedling raising soil is 78-82 percent, the volume water content of the viscous seedling raising soil is 72-76 percent, the volume water content of the seedling raising matrix is 76-80 percent, and the watering is 6-10 mm, which is equivalent to the watering of 0.6L/m2～1.0L/m2The upper limit value (large value) of the water content and the watering amount is taken for the conventional nonglutinous rice variety, the lower limit value (small value) of the water content and the watering amount is taken for the hybrid nonglutinous rice variety and the indica/japonica hybrid rice variety, and the middle value of the water content and the watering amount is taken for the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
Example 1
Experiments were conducted in the Yangzhou province in 2017 and 2018, and sandy seedling raising soil, soil seedling raising soil, viscous seedling raising soil and seedling raising matrix were used respectively. The seedling raising substrate (mixture of vinasse, decomposed straw and vermiculite) is purchased from Huaian Chaihei agriculture science and technology development Co. The varieties to be tested are II Yo084 (hybrid indica rice) and Wuyujing No. 24 (conventional japonica rice), and the seeds are purchased from seed companies in Yangzhou city. From 7 days after sowing to 1 day before transplanting (seedling age 18 days, seedling leaf age 3.3), 2 kinds of water management treatment are set for each seedling raising soil type (including seedling raising substrate) and each variety: (1) a conventional method (contrast), namely a method for managing the moisture of the machine-transplanted rice in the seedling stage in the current production, namely, the seedling raising soil or the seedling raising matrix is kept moist from seeding to 3 days before transplanting, and the moisture supply is controlled from 3 days before transplanting to transplanting; (2) the precise method is the method of the present invention (see table 1). The precision method is different from the conventional seedling stage water management method, and other cultivation measures such as seeding, seedling stage and field stage fertilizing amount and fertilizing method, disease, pest and weed control, field stage water management and the like are completely consistent. The results show that compared with the control (conventional method), the total number of roots, the dry weight of overground part seedlings, the chlorophyll content of leaves, the soluble protein content, the photosynthetic rate and the root system oxidizing power of seedlings cultivated by the accurate method during transplanting, the rooting number, the average root length, the dry weight of roots, the seedling growth rate after 3 days of transplanting, the number of ears in the mature period and the seed setting rate are all obviously increased (tables 2 to 5). The yield of the precision method is increased by 9.06% -12.13% compared with the conventional method (Table 5).
TABLE 2 influence of moisture management method on morphological traits of mechanically transplanted rice seedlings
The data in the table are the average values of 4 kinds of seedling raising soil (matrix) seedlings of sandy seedling raising soil, soil seedling raising soil, viscous seedling raising soil and seedling raising matrix;
the conventional method comprises the following steps: the current common method for managing the moisture of the machine-transplanted rice in the seedling stage in production is that the seedling raising soil or the seedling raising matrix is kept moist from seeding to 3 days before transplanting, and the moisture supply is controlled from 3 days before transplanting to transplanting. The precise method comprises the following steps: performing water management by adopting the method in the table 1;
the measuring period is 18 days after sowing, namely 1 day before transplanting;
the different letters indicated significant differences at the P-0.05 level, compared in the same column within the same year.
TABLE 3 influence of moisture management method on physiological properties of leaves and root system oxidation of mechanically transplanted rice seedlings
The data in the table are the average values of 4 kinds of seedling raising soil (matrix) seedlings of sandy seedling raising soil, soil seedling raising soil, viscous seedling raising soil and seedling raising matrix;
the conventional method comprises the following steps: the current common method for managing the moisture of the machine-transplanted rice in the seedling stage in production is that the seedling raising soil or the seedling raising matrix is kept moist from seeding to 3 days before transplanting, and the moisture supply is controlled from 3 days before transplanting to transplanting. The precise method comprises the following steps: performing water management by adopting the method in the table 1;
the measuring period is 18 days after sowing, namely 1 day before transplanting;
the different letters indicated significant differences at the P-0.05 level, compared in the same column within the same year.
TABLE 4 influence of moisture management method on the emergence status of new roots and the growth rate of overground seedlings after transplanting of mechanically transplanted rice seedlings
The data in the table are the average values of 4 kinds of seedling raising soil (matrix) seedlings transplanted by sandy seedling raising soil, soil seedling raising soil, viscous seedling raising soil and seedling raising matrix;
the conventional method comprises the following steps: the current common method for managing the moisture of the machine-transplanted rice in the seedling stage in production is that the seedling raising soil or the seedling raising matrix is kept moist from seeding to 3 days before transplanting, and the moisture supply is controlled from 3 days before transplanting to transplanting. The precise method comprises the following steps: performing water management by adopting the method in the table 1;
the measuring period is 3 days after transplanting, the roots of the seedlings are cut off during transplanting, the seedlings with the roots cut off are transplanted into a water culture pond with nutrient solution, and the occurrence condition of new roots and the dry weight of the seedlings are measured 3 days after transplanting;
the seedling growth rate (dry weight of overground seedlings 3 days after transplantation-dry weight of overground seedlings in time of transplantation)/days after transplantation;
the different letters indicated significant differences at the P-0.05 level, compared in the same column within the same year.
TABLE 5 influence of water management method for machine-transplanted rice in seedling stage on yield and its constituent factors of transplanted rice
The data in the table are the average values of 4 kinds of seedling raising soil (matrix) seedlings transplanted by sandy seedling raising soil, soil seedling raising soil, viscous seedling raising soil and seedling raising matrix;
the conventional method comprises the following steps: the current common method for managing the moisture of the machine-transplanted rice in the seedling stage in production is that the seedling raising soil or the seedling raising matrix is kept moist from seeding to 3 days before transplanting, and the moisture supply is controlled from 3 days before transplanting to transplanting. The precise method comprises the following steps: performing water management by adopting the method in the table 1;
the determination period is a mature harvest period;
the different letters indicated significant differences at the P-0.05 level, compared in the same column within the same year.
Claims (1)
1. A method for accurately managing water in seedling stage of machine-transplanted rice is characterized in that: according to the type of seedling raising soil and the seedling raising matrix, measuring the volume and the water content of the seedling raising soil and the seedling raising matrix at different leaf ages of the seedlings, taking the volume and the water content as an index of the seedlings needing watering and determining the watering amount, and the method comprises the following steps:
(1) the leaf age of the seedling is less than 0.5
When the volume water content of the sandy seedling raising soil is 94-98%, the volume water content of the soil seedling raising soil is 90-94%, the volume water content of the viscous seedling raising soil is 86-90%, the volume water content of the seedling raising matrix is 88-92%, and the irrigation is 12-16 mm, which is equivalent to the irrigation of 1.2L/m2～1.6 L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(2) seedling leaf age of 0.5-1.5
When the volume water content of the sandy seedling raising soil is 90-94 percent, the volume water content of the soil seedling raising soil is 86-90 percent, the volume water content of the viscous seedling raising soil is 80-84 percent, the volume water content of the seedling raising matrix is 84-88 percent, and the watering is 10-14 mm, which is equivalent to the watering of 1.0L/m2～1.4 L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(3) the seedling leaf age is 1.6-2.4
When the volume water content of the sandy seedling raising soil is 84-88 percent, the volume water content of the soil seedling raising soil is 82-86 percent, the volume water content of the viscous seedling raising soil is 75-79 percent, the volume water content of the seedling raising matrix is 80-84 percent, and the watering is 8-12 mm, which is equivalent to the watering of 0.8L/m2～1.2 L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out;
(4) the seedling leaf age is 2.5-3.5
When the volume water content of the sandy seedling raising soil is 80-84 percent, the volume water content of the soil seedling raising soil is 78-82 percent, the volume water content of the viscous seedling raising soil is 72-76 percent, the volume water content of the seedling raising matrix is 76-80 percent, and the watering is 6-10 mm, which is equivalent to the watering of 0.6L/m2～1.0 L/m2Taking the upper limit values of water content and watering amount of a conventional nonglutinous rice variety, taking the lower limit values of water content and watering amount of a hybrid nonglutinous rice variety and a nonglutinous/japonica hybrid rice variety, and taking the intermediate values of water content and watering amount of the conventional nonglutinous rice variety and the hybrid nonglutinous rice variety; if the volume water content of the seedling raising soil or the seedling raising matrix is higher than the value, watering is not carried out.
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