Abstract: In order to study the effects of water and fertilizer ratio on maize nutrient and yield under different tillage depth,16 experimental treatments were designed to analyze the nitrogen,phosphorus,potassium distribution and yield components of maize organs. The results showed that under the same water and fertilizer conditions,the yield of 30 cm of tillage depth was higher than the depth of cultivation of 20 cm, the maximum yield of treatment was A₁M₂W₃,the maximum yield was 9 950 kg/ha,which increased 46.32% than that of A₁M₁W₀.Nitrogen accumulation in various organs of maize,the order of quantity was grain > leaf > stalk > root. Nitrogen content in stalk and root was the highest in treatment A₁M₂W₃, and nitrogen accumulation in grain and leaf was the highest in treatment A₁M₂W₂. The order of phosphorus accumulation in each organ was:grain > leaf > stalk > root. The order of potassium accumulation in each organ was stem > grain > stalk > root. The highest potassium content in each organ was A₁M₂W₃. When the tillage depth was the same as that of organic fertilizer(A₁M₂),the yield of each treatment increased with the increased of water content.The percentage of nitrogen content in grain to the whole corn plant nitrogen content was 49.57%,49.29%,45.21%,43.82%.The amount of phosphorus was 43.61%,36.69%,43.31%,40.88% and the amount of potassium was 26.05%,29.27%,28.65%,27.79%.Under different tillage depth,proper water and fertilizer ratio had a significant effect on maize yield. Under the control of water and fertilizer level,the tillage depth 30 cm increased the biological yield of maize and the accumulation of nitrogen,phosphorus and potassium in all organs of maize compared with the depth of 20 cm. At the tillage depth of 30 cm and the moisture value of 70%,the absorption and accumulation of nitrogen,phosphorus and potassium in maize were the largest when 7 500 kg/ha was applied to organic fertilizer. Deep rotation can change the soil structure,promote the absorption of water and nutrients by crops,promote the growth of maize roots,enhance the ability of roots to absorb water and nutrients,and improve the absorption and accumulation of nutrients to promote the growth and development of maize.

Key words: Tillage depth, Water and fertilizer coupling, Maize nutrient accumulation, Yield

CLC Number: 

• S152.7

• S143.1