高产夏玉米土肥水综合技术指标的研究

在人工控制土壤肥力及肥、水用量的条件下，按５因素二次回归正交旋转组合设计试验，并运用微机处理数据、建立数模，求得夏玉米不同产量水平的土肥水指标，研究指出，夏玉米对土壤肥力、肥供养分和供水总量的要求均随产量水平而相应提高；磷、钾的肥供比例亦随之加大，钾尤为突出；高产夏玉米（≥７５０ｋｇ／ｍｕ）对氮、磷、钾的吸收比例为２．９３：１：４．０８；氮肥的分配，基施占４１％～４５％，追施占５５％～５９％；供水分配，前期占２５％～３０％，中期占４３％～４９％，后期占２１％～３２％。

The Research on the Soil-Fertilizer-Watering Integrate Technical Indenies of High-yield Summer-sown Maize

the enperiment has been conducted by the schemes of the rotational regnession design of five-factor-quadric orthogoality on the basis of the soils of the man-made fentility difference and under the conductions of the accurate amount of fertilization and watering. And then we have established a senies of the soil-fertilizer-watering technical indncies of high-yield summer-sowm maize ( 750 ～ 1050kg/mu). from the indenies,we can see that the ratio of the amount of P_2O_5、 K_2O in the fertilizer is on the increasealong with the increasing of the unit yield, and that the sucked nutrient ratio is that N:P_2O_5: K_2O is equal to 2.93:1: 4.08.