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为了进一步研究速效氮磷化肥对干旱地区洋芋的增产作用及其防病效果,找出适宜的用量和配合比例,为干旱地区洋芋施用氮磷化肥提供依据,1980年进行了该项试验。试验设在定西县青岚公社碾盘生产队。该队海拔2100多米,年降雨量400毫米左右,年平均气温6.5℃,无霜期120天左右。当年洋芋生育期间降水251毫米,为历年同期平均值326.2毫米的76.9％,仅为上年同期降水量480.7毫米的52.2％。试验地为旱地水平梯田,土质为黄麻土。前茬春小麦,麦收后用老犁、步犁各翻一次,步犁耕深七寸,临冬打耱一次。
In order to further study the effects of quick-acting nitrogen and phosphorus fertilizers on the yield-increasing effect of potato and its control effect in arid areas, find out the suitable dosage and proportion, and provide the basis for the application of nitrogen and phosphorus fertilizers in potato fields in arid areas. Test set in Dingxi County Qinglan commune Nianpan production team. The team at an altitude of 2100 meters, annual rainfall of about 400 mm, the annual average temperature of 6.5 ℃, frost-free period of 120 days. In the same year, the rainfall of plum was 251 millimeters, which was 76.9% of the average of 326.2 millimeters in the same period of last year and only 52.2% of the 480.7 millimeters of precipitation in the same period of last year. Test ground level of dry land terraces, soil is jute soil. Precursor spring wheat, wheat harvest with the old plow, step plow turned over each step Plow deep plowing seven inches, winter hit once.