CN102017839A - Simplified fertilizer application method of wheat and corn crop rotation anniversary - Google Patents
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Abstract
The invention relates to a simplified fertilizer application method of wheat and corn crop rotation anniversary, which is changed into an anniversary fertilizer application method that fertilizer application is carried out twice in a wheat season and fertilizer application is carried out once in a corn season from a traditional habitual fertilizer application method that the fertilizer application is carried out twice or three times in a wheat season and fertilizer application is carried out more than twice in a corn season. Wheat slow release fertilizer and corn slow release fertilizer are applied on crops, which not only can plan and consider the nutrient requirement of the anniversary of two-crop crops and ensure dependable crop and increasing yield of the crops but also can simplify fertilizer application times to a great extend and save labor force.
Description
Technical field
The present invention relates to a grow wheat, the corn crop rotation anniversary simplify fertilizing method, belong to the technical field that long-acting slow-release is fertile and use.
Background technology
The North China is the main producing region of China's grain, it is special that winter wheat-this typical cropping system of summer corn two crops a year rotation system is the main food planting patterns in the Yellow River and Huai He River Haiti, North China district, no matter be cultivated area or unit yield, the very big degree of the cereal product of producing under this rotation system has guaranteed the grain security of China.The generally sowing at the beginning of 10 months of this area winter wheat, the early June or the middle ten days gather in the crops, and then summer corn is sowed in mid-June, with results by the end of September or at the beginning of 10 months, just in time striden across a crop rotation anniversary breeding time of two kinds of crops, fertilizer nutrient occupies the contribution 50% or more in the process that grain yield improves, thereby winter wheat and the fertilising of this rotation cycle of summer corn distribution just seem particularly important.Winter wheat is longer breeding time, half of summer corn too late winter wheat breeding time, two kinds of crops differ widely to the aggregate demand of nutrient and the nutrient uptake feature of different phase, especially at present most of regional wheat and maize straw all also under the situation in field the input to nutrient new understanding should be arranged.
The peasant in the conventional fertilizer application method of winter wheat and summer corn is in the agricultural production at present:
1. apply whole phosphorus potash fertilizer and half of nitrogenous fertilizer total amount before the winter wheat sowing, turn green spring in the coming year to the shooting stage and spread fertilizer over the fields or ditch and use half nitrogenous fertilizer of residue, the sufficient peasant household of part labour front and back some instant nitrogenousfertilizers of supplementation administration again that can at the beginning of 5 months, bes in the milk;
2. on corn, the peasant can or apply 30% nitrogenous fertilizer and whole phosphorus potash fertilizer with sowing after emerging, and imposes the nitrogenous fertilizer of residue 70% at trumpet period, and the sufficient peasant household of part labour is the supplementation administration instant nitrogenousfertilizer in the watery stage.
One anniversary got off, it is 4 times that the peasant enters the least number of times of applying fertilizer in the piece of field, and many persons reach 6 times, the nutrient demand rule of crop though fertilizing time coincide, but lavish labor on greatly, because the rate of release of quick-acting fertilizer nutrient is very fast, can not satisfy the needs that crop absorbs nutrient simultaneously, individual stage also can cause takes off fertile phenomenon.In recent years, because the particularly between twenty and fifty labourer's major part of rural laborer shifts to the city, labour's restriction makes the wheat and corn fertilizer application frequency that the trend of minimizing be arranged, and use the higher relatively controlled release fertilizer of price because of considering that the economic factor majority not will consider, this just more can not satisfy the nutrient demand of crop, the plant individuality is bigger the plant growth later stage in addition, be not suitable for mechanized, the peasant often manually spreads fertilizer over the fields instant nitrogenousfertilizer with advancing and carries out topdressing of one period of back in conjunction with the mode of watering, this mode has strengthened the risk of the downward leaching of nitrogen, thereby influence quality of groundwater, can waste fertilizer again, reduce nitrogen utilization efficiency, the peasant household that has does not just carry out this time crucial topdressing without hesitation because of operating difficulties, thereby has entered the mistaken ideas that produce.
Therefore, simplify the actual demand that fertilizer application frequency and fertilising operation can satisfy peasant's operation in the reality production in rotation cycle, have stronger vitality and development trend, this has just had higher requirement to fertilizer itself: fertilizer itself should satisfy the slow release of nutrient and supply stage by stage, consider the suitable proportion of rotation crop nutrient demand again as a whole, particularly also particularly important under the situation in field in present maize straw large tracts of land.The application of controlled release fertilizer is now more and more general, but its higher relatively price allows the peasant hang back, and fertilizer product in the past and technology can not satisfy the demand of crop whole growing.For example very easily to cause relatively long breeding time to take off fertile phenomenon and price at wheat higher relatively in later stage for Chinese patent CN1609075 " winter wheat is used production process of slowly/controlled releasing fertilizer "; The nutrient demand of Chinese patent CN101492319 " fertilizer specially for wheat and application thereof " wheat though its special-purpose fertile prescription coincide, fertilising need enter the field three times, and the labour drops into more; Chinese patent CN 101209935 " a kind of corn fertilizer and application thereof " is then only at the present situation of spring corn fertilising, and the fertilising in large tracts of land winter wheat Summer Maize Rotation grain district, the Yellow River and Huai He River sea is planned strategies for then not to be related to.
Summary of the invention
At the deficiencies in the prior art, the invention provides and a grow wheat and corn crop rotation anniversary simplify fertilizing method, not only can consider the nutrient demand in crop anniversary as a whole, can not cause the underproduction crop, also greatly degree is simplified fertilizer application frequency, reaches liberation labour's real purpose.
One grow wheat, corn crop rotation anniversary are simplified fertilizing method, and step is as follows:
1) before wheat cultivation 1-2 days or with the sowing disposable employed wheat slow-release fertilizer, fertilizing amount is: 50-55kg/ mu; The fertilizer nutrient that this time fertilising provides is a N 9-11kg/ mu, P
2O
57-9kg/ mu, K
2O 4-6kg/ mu, the nutrient that provides can guarantee that wheat emerges to the nutrient demand of next spring before turning green.Described wheat slow-release fertilizer, weight portion is composed as follows:
Nitrogenous fertilizer 18-22 part, phosphate fertilizer 14-18 part, potash fertilizer 8-12 part, NAM additive 0.5-1 part, zinc sulphate 1-2 part.
2) turn green to applied nitrogen between the shooting stage and potash fertilizer at wheat, the amount of application of nitrogenous fertilizer (urea) is a 17-22kg/ mu, and the amount of application of potash fertilizer (potassium chloride) is a 3.5-7kg/ mu; The fertilizer nutrient that this time fertilising provides is a N 8-10kg/ mu, K
2O 2-4kg/ mu, nitrogen, the potassium that both can replenish the wheat growth later stage are under-supply, and can and emerge for the sowing of corn again provides basic nutrition.
3) shooting stage of corn to the toy trumpet mouth phase, disposable employed corn slow-release fertilizer, fertilizing amount is a 48-56kg/ mu; The fertilizer nutrient that fertilising this time provides is a N 10-12kg/ mu, P
2O
56-8kg/ mu, K
2O 6-8kg/ mu, can guarantee corn shooting stage and toy trumpet mouth phase after corn to various nutrient demand.Described corn slow-release fertilizer, weight portion is composed as follows:
Nitrogenous fertilizer 20-24 part, phosphate fertilizer 12-16 part, potash fertilizer 12-16 part, NAM additive 1-1.5 part, zinc sulphate 1-1.5 part.
Above step 1), 3) the NAM additive described in is the depot fertilizer additive for compound fertilizer, and main component is nitrification inhibitor, urease inhibitor and phosphorus activating agent etc.; The NAM additive can make fertilizer efficiency period extend to 90-120 days.
Described nitrogenous fertilizer be one of urea, carbonic hydroammonium or with diammonium phosphate combination, preferred urea;
Described phosphate fertilizer is one of diammonium phosphate, superphosphate, double superphosphate or combination, preferred double superphosphate;
Described potash fertilizer is one of potassium sulphate, potassium chloride or combination, preferred potassium chloride.
In the described step 1) before wheat cultivation 1-2 days fertilization mode for spreading fertilizer over the fields.
Fertilization mode in the described step 1) when wheat cultivation is to utilize wheat cultivation fertilising all-in-one simultaneously seed and wheat slow-release fertilizer to be sowed, and the wheat slow-release fertilizer is at the seed side-lower, the vertical 5-7cm of being separated by with seed, the side direction 4-6cm of being separated by.This step can reach the purpose of concentrating fertilising and simplifying procedures.This kind mode is particularly suitable under the condition of preceding stubble maize straw, adopt the whole ground of mechanical rotary tillage or deep ploughing after, apply fertilizer simultaneously with wheat cultivation.
Described step 2) fertilization mode is that wheat opens dressing furrow in the ranks in: open a row application ditch in the middle of per two row wheats, ditch depth 5-7cm, fertilising back earthing.
Fertilization mode is that corn is opened dressing furrow in the ranks in the described step 3): every capable corn is all opened the dressing furrow of a dark 8-10cm in the same side, and dressing furrow and corn planting are capable of 20-25cm, fertilising back earthing.
Step 1), 3) the wheat slow-release fertilizer in, the preparation of corn slow-release fertilizer are that described each raw material is mixed in proportion, promptly.
Characteristics of the present invention are:
1, more different coated fertilizers of employing and the processing technology of existing slow-release or control-release fertilizer kind, the cost that forms commodity is higher relatively, and not on the extra high wheat and corn crop in economic worth, the peasant often considers to pay the balance with income, slow-release fertilizer of the present invention is formed by common common fertilizer ratio blending, and cost is relatively low;
2, in common fertilizer, add this special use fertilizer that NAM depot fertilizer additive forms, have the long-acting feature similar with coating controlled-release fertilizer on the market, but it is a two-way collaborative mutually short action principle of having used nitrification inhibitor, urea inhibitor, can delay hydrolysis of urea speed, increased the ammonium concentration of soil, suppress the conversion rate of ammonium nitrogen simultaneously to nitrate nitrogen, and adopted the phosphorus activating technology, activation discharges the phosphorus in the soil, prevent that the phosphorus in the fertilizer from fixing, make it the term of validity that keeps longer, have the function of lasting supply crop nutrition content;
3, slow-release fertilizer of the present invention can use immediately by manually evenly being mixed or machinery is mixed and forms, and has simple, convenient, flexible characteristics;
4, generally go back the production status in field at the Yellow River and Huai He River Haiti district maize straw, generally paying attention under the theoretical direction of moving behind the wheat quaternary nitrogen fertilizer, owing to need a considerable amount of nitrogens in the microbial decomposition stalk process, the phenomenon that easy generation microorganism in early stage and wheat seedling are striven nitrogen, wheat is reduced the absorption of nitrogen, cause the seedling leaf jaundice, thereby influence the growth and the growth in later stage, the present invention has had a mind to improve the nitrogenous fertilizer usage amount in early stage, do not reduce the nitrogen amount of imposing of wheat during jointing stage simultaneously, have the facilitation of two aspects;
5, anniversary of the present invention is simplified nutrient demand and the distribution that fertilization method has been considered wheat-corn rotation crop different phase in a year as a whole, the prescription of two kinds of slow-release fertilizers is reasonable, and impose the part nitrogen and the potassium element can satisfy the defective that wheat growth later stage fertilizer specially for wheat fertilizer efficiency can't last till this stage at wheat during jointing stage, suitably replenished before corn season shooting stage small requirements again to the nitrogen potassium nutrition, this fertilization method has been avoided the burning seedling phenomenons that a large amount of use in seedling stage high-nitrogen compound fertilizer causes in the present Maize Production, can reach the dual purpose of crop yield and raising utilization rate of fertilizer.The anniversary crop yield can reach 70-120kg/ mu, and utilization rate of nitrogen fertilizer improves 4-6 percentage point;
6, use the corn slow-release fertilizer in shooting stage in corn season to the toy trumpet mouth phase, small manual is mechanical or manually can easily enter operations such as implementing trench digging, fertilising, earthing in the ranks, can not cause plant damage, the corn slow-release fertilizer with slow release effect is this time used and can be satisfied whole late growth stage to nutrient demand;
7, compare field operation in the production, this invention enters the operation that the field piece applies fertilizer in an anniversary has only 3 times, compares with 4-5 fertilising of traditional habit, has liberated the labour greatly.All annual is saved the labour and is dropped into 35-70 unit/mu.
Embodiment
By the following examples the present invention is further specified, but the present invention is not limited only to following examples.The used NAM additive of embodiment is the durable composite fertilizer additive, is produced by Shenyang Zhongke New Fertilizer Co., Ltd.
Embodiment 1:
The preparation of slow release fertilizer:
One grow wheat slow-release fertilizer (I), parts by weight of raw materials is as follows:
Nitrogenous fertilizer: 20 parts is urea and diammonium phosphate,
Phosphate fertilizer: 16 parts is diammonium phosphate,
Potash fertilizer: 10 parts is potassium chloride,
The NAM additive: 0.6 part,
Zinc sulphate: 1.2 parts, described zinc sulphate is white vitriol.
Above-mentioned fertilizer material is mixed, get wheat slow-release fertilizer (I).
A kind of corn slow-release fertilizer (II), parts by weight of raw materials is as follows:
Nitrogenous fertilizer: 22 parts is urea,
Phosphate fertilizer: 12 parts is double superphosphate,
Potash fertilizer: 13 parts is potassium chloride,
The NAM additive: 1.2 parts,
Zinc sulphate: 1.4 parts, described zinc sulphate is white vitriol.
Above-mentioned raw materials fertilizer is mixed, get corn slow-release fertilizer (II).
Above-mentioned wheat slow-release fertilizer and corn slow-release fertilizer are used for following simplification fertilizing method.
One grow wheat, corn crop rotation anniversary are simplified fertilizing method, and step is as follows:
1) 1-2 days disposable wheat slow-release fertilizers (I) that spread fertilizer over the fields before wheat cultivation, this time fertilizing amount is a 50kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 10kg/ mu, P
2O
58kg/ mu, 5K
2O kg/ mu, satisfy substantially wheat emerge turn green to the coming year between plant to various nutrient demand.
2) turn green to applied nitrogen between the shooting stage and potash fertilizer at wheat, nitrogenous fertilizer is urea (N content is 46%), and amount of application is a 20kg/ mu, and potash fertilizer is potassium sulphate (K
2O content is 50%), amount of application is a 7kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 9.2kg/ mu, K
2O 3.5kg/ mu, the nitrogen potassium that both can replenish the wheat growth later stage under-supply (the NAM additive can make fertilizer efficiency period extend to 90-120 days), can and emerge for the sowing of corn again provides basic nutrition.Fertilization mode is that wheat opens dressing furrow in the ranks: open a row application ditch in the middle of per two row wheats, ditch depth 6cm, fertilising back earthing.
3) at shooting stage to toy trumpet mouth phase of corn (behind the corn seeding 30-40 days), disposable employed corn slow-release fertilizer (II), fertilizing amount is a 50kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 11kg/ mu, P
2O
56kg/ mu, K
2O 6.5kg/ mu, can guarantee the corn jointing or after the toy trumpet mouth phase corn to various nutrient demand.Fertilization mode is that corn is opened dressing furrow in the ranks: every capable corn is all opened the dressing furrow of a dark 8cm in the same side, and dressing furrow and corn planting are capable of 23cm, fertilising back earthing.
Through the field trial in 2 years, apply fertilizer than peasant habit by using above-mentioned fertilizing method, the wheat of output on average increases production 48.5kg/ mu; By using the said method fertilising than the peasant habit fertilising, the corn of output on average increases production 63.5kg/ mu.Rotation cycle average labour of saving that gets off drops into 50 yuan/mu, and net profit can reach 155 yuan/mu, and the comparable peasant habit fertilising of utilization rate of nitrogen fertilizer improves 5.2 percentage points.Be specially adapted to the production of the Yellow River and Huai He River Haiti district wheat-corn anniversary rotation system.
Embodiment 2:
One grow wheat slow-release fertilizer (III), parts by weight of raw materials is as follows:
Nitrogenous fertilizer: 18 parts is urea and diammonium phosphate,
Phosphate fertilizer: 16 parts is diammonium phosphate,
Potash fertilizer: 10 parts is potassium sulphate,
The NAM additive: 0.8 part,
Zinc sulphate: 1.5 parts, described zinc sulphate is white vitriol.
Above-mentioned fertilizer material is mixed, get wheat slow-release fertilizer (III).
A kind of corn slow-release fertilizer (IV), parts by weight of raw materials is as follows:
Nitrogenous fertilizer: 21 parts is urea and diammonium phosphate,
Phosphate fertilizer: 13 parts, diammonium phosphate,
Potash fertilizer: 14 parts, potassium chloride,
The NAM additive: 1.3 parts,
Zinc sulphate: 1.2 parts, described zinc sulphate is white vitriol.
Above-mentioned raw materials fertilizer is mixed, get corn slow-release fertilizer (IV).
Above-mentioned wheat slow-release fertilizer and corn slow-release fertilizer are used for following simplification fertilizing method.
One grow wheat, corn crop rotation anniversary are simplified fertilizing method, and step is as follows:
1) 1-2 days disposable wheat slow-release fertilizers (III) that spread fertilizer over the fields before wheat cultivation, consumption is a 55kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 9.9kg/ mu, P
2O
58.8kg/ mu, 5.5K
2O kg/ mu, satisfy substantially wheat emerge turn green to the coming year between plant to various nutrient demand.
2) turn green to applied nitrogen between the shooting stage and potash fertilizer at wheat, described nitrogenous fertilizer is urea (N content is 46%), and amount of application is a 24kg/ mu, and described potash fertilizer is potassium chloride (K
2O content is 60%), amount of application is a 5kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 11kg/ mu, K
2O 3kg/ mu, the nitrogen potassium that both can replenish the wheat growth later stage under-supply (the NAM additive can make fertilizer efficiency period extend to 90-120 days), can and emerge for the sowing of corn again provides basic nutrition.Fertilization mode is that wheat opens dressing furrow in the ranks: open a row application ditch in the middle of per two row wheats, ditch depth 7cm, fertilising back earthing.
3) at shooting stage to toy trumpet mouth phase of corn (behind the corn seeding 30-40 days), disposable employed corn slow-release fertilizer (IV), fertilizing amount is a 48kg/ mu.The fertilizer nutrient that fertilising this time provides is a N 10kg/ mu, P
2O
56.2kg/ mu, K
2O 6.7kg/ mu, can guarantee the corn jointing or after the toy trumpet mouth phase corn to various nutrient demand.Fertilization mode is that corn is opened dressing furrow in the ranks: every capable corn is all opened the dressing furrow of a dark 9cm in the same side, and dressing furrow and corn planting are capable of 25cm, fertilising back earthing.
Through the field trial in 2 years, apply fertilizer than peasant habit by using above-mentioned fertilizing method, the wheat of output on average increases production 45kg/ mu; By using above-mentioned fertilizing method to apply fertilizer than peasant habit, the corn of output on average increases production 55kg/ mu.Rotation cycle average labour of saving that gets off drops into 55 yuan/mu, and net profit can reach 145 yuan/mu.
Embodiment 3: wheat, corn crop rotation anniversary are simplified fertilizing method
Under the condition of preceding stubble maize straw, behind the whole ground of employing machinery deep ploughing, carry out following operation:
1) wheat slow-release fertilizer (I) and wheat seed apply the field piece by wheat cultivation fertilising all-in-one simultaneously, and fertilizer is at the seed side-lower, the vertical 6cm of being separated by with seed, and the side direction 5cm of being separated by, the fertilising consumption is a 55kg/ mu;
2) turn green to using urea (N content is 46%) 18kg/ mu, potassium chloride (K between the shooting stage at wheat
2O content is 60%) 6kg/ mu, method of application is in the ranks to ditch at wheat with an animal-drawn seed plough to use back earthing, ditch depth 7cm;
3) after the shooting stage of corn in 10 days, disposable employed corn slow-release fertilizer (IV), fertilizing amount are 52kg/ mu, and fertilization mode is that corn is opened dressing furrow in the ranks: every capable corn is all opened the dressing furrow of a dark 10cm in the same side, dressing furrow and corn planting are capable of 24cm, fertilising back earthing.
By using above-mentioned fertilizing method to apply fertilizer than peasant habit, the wheat of output on average increases production 53kg/ mu; By using above-mentioned fertilizing method to apply fertilizer than peasant habit, the corn of output on average increases production 66kg/ mu.Rotation cycle average labour of saving that gets off drops into 65 yuan/mu, and net profit can reach 172 yuan/mu, and the comparable peasant habit of utilization rate of nitrogen fertilizer improves 4.8 percentage points.
Embodiment 4: wheat, corn crop rotation anniversary are simplified fertilizing method
Under the condition of preceding stubble maize straw, adopt mechanical rotary tillage soil-working after, carry out following operation:
1) wheat slow-release fertilizer (III) and wheat seed apply the field piece by wheat cultivation fertilising all-in-one simultaneously, and fertilizer is at the seed side-lower, the vertical 7cm of being separated by with seed, and the side direction 4cm of being separated by, the fertilising consumption is a 50kg/ mu;
2) turn green to the shooting stage at wheat and use carbonic hydroammonium (N content is 17%) 60kg, potassium sulphate (K
2O content is 50%) 5kg, method of application is in the ranks to ditch at wheat with an animal-drawn seed plough to use back earthing, ditch depth 6cm;
3) after the shooting stage of corn in 7 days, disposable employed corn slow-release fertilizer (IV), fertilizing amount are 56kg/ mu, and fertilization mode is that corn is opened dressing furrow in the ranks: every capable corn is all opened the dressing furrow of a dark 8cm in the same side, dressing furrow and corn planting are capable of 25cm, fertilising back earthing.
By using above-mentioned fertilizing method to apply fertilizer than peasant habit, the wheat of output on average increases production 42kg/ mu; By using above-mentioned fertilizing method to apply fertilizer than peasant habit, the corn of output on average increases production 65.5kg/ mu.Rotation cycle average labour of saving that gets off drops into 50 yuan/mu, and net profit can reach 152 yuan/mu, and the comparable peasant habit of utilization rate of nitrogen fertilizer improves 5.8 percentage points.
Claims (9)
1. a grow wheat, corn crop rotation anniversary are simplified fertilizing method, it is characterized in that step is as follows:
1) before wheat cultivation 1-2 days or with the sowing disposable employed wheat slow-release fertilizer, fertilizing amount is: 50-55kg/ mu; Described wheat slow-release fertilizer, weight portion is composed as follows:
Nitrogenous fertilizer 18-22 part, phosphate fertilizer 14-18 part, potash fertilizer 8-12 part, NAM additive 0.5-1 part, zinc sulphate 1-2 part;
2) turn green to applied nitrogen between the shooting stage and potash fertilizer at wheat, the amount of application of nitrogenous fertilizer is a 8-10kg N/ mu, and the amount of application of potash fertilizer is 2-4kg K
2O/ mu;
3) shooting stage of corn to the toy trumpet mouth phase, disposable employed corn slow-release fertilizer, fertilizing amount is a 48-56kg/ mu; Described corn slow-release fertilizer, weight portion is composed as follows:
Nitrogenous fertilizer 20-24 part, phosphate fertilizer 12-16 part, potash fertilizer 12-16 part, NAM additive 1-1.5 part, zinc sulphate 1-1.5 part.
2. method according to claim 1 is characterized in that, step 1), 3) described in the NAM additive be the depot fertilizer additive for compound fertilizer.
3. method according to claim 1 is characterized in that, described nitrogenous fertilizer is one of urea, carbonic hydroammonium or makes up with diammonium phosphate.
4. method according to claim 1 is characterized in that, described phosphate fertilizer is one of diammonium phosphate, superphosphate, double superphosphate or combination.
5. method according to claim 1 is characterized in that, described potash fertilizer is one of potassium sulphate, potassium chloride or combination.
6. method according to claim 1 is characterized in that, in the described step 1) before wheat cultivation 1-2 days fertilization mode for spreading fertilizer over the fields.
7. method according to claim 1, it is characterized in that, fertilization mode in the described step 1) when wheat cultivation is to utilize wheat cultivation fertilising all-in-one simultaneously seed and wheat slow-release fertilizer to be sowed, the wheat slow-release fertilizer is at the seed side-lower, the vertical 5-7cm of being separated by with seed, the side direction 4-6cm of being separated by.
8. method according to claim 1 is characterized in that, described step 2) in fertilization mode be that wheat opens dressing furrow in the ranks: per two row are opened a row application ditch in the middle of the wheats, ditch depth 5-7cm, fertilising back earthing.
9. method according to claim 1, it is characterized in that, fertilization mode is that corn is opened dressing furrow in the ranks in the described step 3): every capable corn is all opened the dressing furrow of a dark 8-10cm in the same side, and dressing furrow and corn planting are capable of 20-25cm, fertilising back earthing.
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