河西走廊日光温室主要土类供磷能力及蔬菜磷素最佳施用量的研究

Phosphorus supply ability of soils and optimum phosphorus application rate for vegetables in the greenhouses in Hexi Corridor

在日光温室内,采用田间试验方法,研究了河西走廊主要土类供磷能力及蔬菜磷素最佳施用量,结果表明：盐化潮土、暗灌漠土、淡灌漠土、潮土、灌漠土,耕层0～20 cm供磷能力最低为12.26 kg/hm2时,最高为18.78kg/hm2,平均为15.30 kg/hm2.经回归统计分析,西葫芦、黄瓜、茄子、番茄、辣椒磷素经济效益最佳施肥量分别为182、269、49、468、60 kg/hm2时,理论产量分别为83.9、82.2、65.4、98.4、72.3t/hm2,回归统计分析结果与田间试验结果基本吻合.

A field experiment was conducted to study the phosphorus supply capacity of the main soil types and optimum application amount of phosphorus for vegetables in greenhouses in the Hexi Corridor.The results show that,for saline soil,dark irrigated desert soil,light irrigated desert soil,Chao soil and irrigated desert soil,the minimum phosphorus supply capacity of 0～20 cm topsoil was 12.26 kg/hm2,while the maximum was 18.78 kg/hm2,wirh an average of 15.30 kg/hm2.The regression statistical analysis showed that the optimum economic fertilization rate of phosphorus was 182,269,49,468 and 60 kg/hm2 for squash, cucumber,eggplant,tomato and pepper respectively,with which the theoretical yield was 83.9,82.2,65.4,98.4 and 72.3 t/hm2.The result of regression analysis was consistent with that of field test.