| Under dry-farming conditions,quadratic regression and orthogonal design was used to study the correlation effects of density as well as amount and ratio of N and P to yield of Dingwan No.2 in different places,and the effective technologies for applying molybdenum and water absorbant.According to the results of test and demonstration,65 technological schemes were found through computer analysis,in which the yield of Dingwan No.2 reached 1 950～2 653 kg/hm2.The 95% confidence interval of the schemes: seeding rate 109.5×104～148.5×104 grains/hm2;N 45～64.5 kg/hm2,P2O5 112.5～147 kg/hm2,N/P2O5=100/237;ditching water absorbant material 7.5 kg per hm2,ammonium molybdate for seed dressing 4 g/1000g.It is concluded that rational utilization of N(optimization of N and P),seed dressing with ammonium molybdate and proper application of water absorbant are effective ways to improve the production of Dingwan No.2 in dryland. |