甘肃沿黄灌区高产农田培肥指标的试验研究

对沿黄灌区高产栽培的主要模式──小麦玉米带田的配方施肥、土壤和作物养分供吸动态规律、化肥施量与作物产量的关系以及产高农田的土壤肥力变化进行了３年的试验研究，总结出在９×１０￣４ｋｇ／ｈｍ￣２优质农肥的基础上，化肥投施量为３７５～４５０ｋｇＮ／ｈｍ￣２，２２５～２７０ｋｇＰ＿２Ｏ＿５／ｈｍ￣２是该区高产农田（≥１５００ｋｇ／ｈｍ￣２）的最佳培肥方案，并定出高产农田土壤肥力二级营养指标。

Studies on Fertilizer Applying Indexes of High-yielding Farmland in the Irrigated Areas Along the Yellow-River in Gansu Province

Exporiments including the formula fertilizer application,the nutrient supplied andabsorbed dynamics of soil and crop,the relationship between the amount of chemical fertilizer andyield of crop,and the changes of soil fertility for the main high-yielding cultivation model-wheatand corn stripping field were conducted for 3 years in the irrigated areas along the Yellow-river.Theresults showed that on the basis of applying 9×10￣4kg/hm￣2 of fine farm manure the optimum chemi-cal fertilizer applying plan was 375～450 kg/hm￣2 of N and 225～270 kg/hm￣2 of P_2O_5. The grade-2 nutrient index of soil fertility of the high-yielding farmland was also worked out.