河西灌漠土钾素状况及当季施肥效应 |
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引用本文: | 索东让,王平,侯格平,梁国森.河西灌漠土钾素状况及当季施肥效应[J].甘肃农业大学学报,2001,36(2):184-187. |
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作者姓名: | 索东让 王平 侯格平 梁国森 |
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作者单位: | 1. 甘肃省张掖地区农科所 2. 甘肃省张掖地区农科所, |
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摘 要: | 多点调查表明,河西灌漠土全钾比70年代末平均降低了24.4%,速效钾平均下降了41.2%。剖面分布为:耕作层全钾平均为1.30%,20~60cm土层平均1.27%~1.38%,底土平均1.26%;缓效钾平均为946~1 006mg/kg,剖面差异不大;速效钾 0~20cm土层为145mg/kg,20~100cm平均101~114mg/kg。春小麦、玉米、甜菜、洋芋单作当季施钾均无明显增产效应;带田玉米施化学钾肥增产8.5%,施土粪增产9.7%~11.3%,但增效不稳定。
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关 键 词: | 灌漠土 钾素 施肥 作物产量 河西地区 |
文章编号: | 1003-4315(2001)02-0184-04 |
The potassium condition of irrigated desert soil in the Hexi district and the annual effects of potassium fertilizers |
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Abstract: | :The results of soil survey by S-shaped point cluster method show that the total potassium content of irrigated desert soil in the Hexi district has decreased by the average of 24.4%, and the active potassium content has decreased by the average of 41.2% from the end of 1970s' to now. the general condition of potassium distribution in the soil profiles present as follows: the average of total potassium content is 1.30% in the arable layer; 1.27% to 1.38% in the soil layer from 20cm to 60cm depth and 1.26% in the layer of bottom soil; the average of the slow-release potassium content range from 946mg/kg to 1006mg/kg, and the differences between soil layers are not worth of mentioning; the active potassium content in the soil layer from 0cm to 20cm depth is 145mg/kg, and the average in the layer from 20cm to 100cm depth range from 101mg/kg to 114kg/kg. The results of field experiments indicate that applying potassium fertilizers in the same year had not obvious effects on yield increase of spring wheat, maize, beet and potato in monoculture; while the yield of maize belt-planted, appled with chemical potassium fertilizers, can increase by 8.5%, and with organism fertilizer it can increase by 9.7% to 11.3%, but the effects of increase is unstable. |
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Keywords: | :irrigated desert soil potassium fertilization Crop yield Hexi district |
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