Precocious Seeding Rape Of Paddy Different Nitrogen,Phosphorus And Potassium Appliedthe Amount Of Research

In order to maximize the value of fallow fields, improve multiple-cropping index, resolve the grain and oil conflicts and research and develop new species adapted to three precocious "Rice-Rice-Oil " model, we adopted field test methods and designed three experiments of nitrogen, phosphorus and potassium under different concentration gradients to study the agronomic shape, SPAD value, nutrient dynamics and yield changes of precocious live "canola oil Xiangzayou1358", The main results are as follows:1、The more nitrogen fertilizer, the more vigorous rapeseed plants grow during winter to ensure the vitality of more blades. High nitrogen level will not inhibit the growth of winter canola while high phosphorus and potassium level can bring the inhibition. Reasonable amount of N will promote new leaf growth and delay old leaves fall off while reasonable amount of P and K promote new leaf growth and also promote the shedding of old leaves at the same time. Excessive nitrogen fertilizer during the harvest, resulting in excessive vegetative, increasing invalid pod, declined branching position reducing the yield and quality. The higher amount of P can suppress the overall growth of rapeseed, an excess of K can cause Branch level drop and increasing number of branches. Throughout the growth period, nitrogen and phosphorus can fully develop the potential of canola grown by reducing the trait variability while potash can bring the same effect by improving the overall variability in order to obtain a higher yield. In the winter, nitrogen and phosphorus can balance canola growing by reducing its trait variability while potash achieves that by increasing trait variability. In the harvest, phosphate can improve the production of canola by reducing traits variability while nitrogen and potash by increasing traits variability. Nitrogen fertilizer mainly affect pod number per plant and grains per pod and ultimately affect the yield through acting on plant height, number of branches and main stem section; fertilizer can influence the pod number per plant to increase the production by effecting plant height, branch position, number of sections of main stem and branches and the width of Rhizome; potash is mainly reflected in that more branches can bring a higher yield.2、The influence of different kinds of nutrition for early-maturity direct-seeding rapeseed chlorophyll content in wintering period is various, nitrogen fertilizer has a greater effect, phosphate and potash fertilizer effect is less; The chlorophyll content of per unit area declines with a dropping of leave position and is the highest in the last leaf. The higher the nitrogen fertilizer,the slower declining rate of chlorophyll content and the higher the phosphate dosage and the amount of potassium fertilizer,the faster the declining rate, the chlorophyll content declines as the lowest rate, when the phosphate fertilizer usage is at90kg/hm2The left area is faster than the right in the synthesis of chlorophyll of rape leaves in the wintering period and it extends from the tip to petiole leaf. While the right area is faster than the left area in the chlorophyll decomposition of old leaves and continuous decompose from the tip to petiole. Different nitrogen, phosphorus and potassium fertilizer trials represent diverse leave area in the level of average chlorophyll content of per unit area rapeseed in the stage of wintering. Nitrogen fertilizer experiment is the most representative in the middle of left area of the penultimate leaf(D2),Y=0.5254X+11.684, R2=0.4538. Phosphate fertilizer trial is the most representative in the apex of right area of the fourth from bottom leaf(D4),Y=0.2049X+25.147, R2=0.7560.The apex of left area of penultimate leaf(D2)can represent chlorophyll average level of per unit area. In all, the results provide theoretical guidance and practical basis to rapid determination of early prematurely direct-seeding rapeseed chlorophyll.3、With the increase of nitrogen fertilizer, nitrogen nutrient content of winter oilseed rape continues to rise and high nitrogen will inhibit the sustained increase of nutrient content of phosphorus and potassium. But the nitrogen, phosphorus and potassium nutrient accumulation all showed a significant increasing trend in pace with the increase of nitrogen fertilizer. Despite different amount of phosphate has no significant effect on nitrogen, phosphorus and potassium content, there are still significant differences in the nutrients accumulation and show up increasing first and then decreasing. The increase of Potash consumption did not affect nitrogen content, but can lead to decreased phosphorus nutrient content and increased potassium nutrient content. In addition, the higher the amount of potash will suppress the accumulation of nutrients. In the harvest, with the increasing amount of nitrogen, the nutrient content in straw and grain first increased and then decreased; the nutrient accumulation of nitrogen, phosphorus and potassium also increased first and then decreased; phosphorus content in straw and grain increased with the increasing content of the fertilizer dosage and the accumulation of nutrients decreased after the first lift. The nutrient accumulation in grain showed a variation of first increasing and then decreasing; with the increasing amount of potash, the nutrient accumulation of nitrogen and potassium in straw changed after first increased overall; in grain, the nutrient accumulation of nitrogen, phosphorus and potassium first lift and then decreased.4、Economic amount of nitrogen is139.94kg/hm2, phosphorus is122.97kg/hm2, potash is93.65kg/hm2.