摘要
进行了钾肥不同用量的田间试验,以验证河西绿洲富钾的灌漠土壤施用钾肥对小麦/玉米带田是否有增产效果。试验采用随机区组设计,设5个K处理,施K2O分别为：0、751、50、2253、00 kg/hm^2。结果表明,钾肥能提高小麦/玉米带田栽培条件下两种作物产量,和不施钾肥相比,小麦带增产5.1%-8.9%,玉米带增产2.8%-8.1%,小麦/玉米带田总产提高3.3%-7.8%;当施钾量为75 kg/hm^2,小麦/玉米带田总产量为最高,达12 994kg/hm^2,与不施钾肥相比,总产量增加936 kg/hm^2,增产7.8%。钾肥能提高小麦秸秆钾含量和吸钾量,与不施钾肥相比,小麦秸秆含钾量提高4.31%-7.84%,吸钾量提高6.2%-9.6%;但玉米秸秆钾含量和吸钾量有所降低,与不施钾肥相比,玉米秸秆含钾量减少20%-24.86%,吸钾量减少25.7%-28.7%。这是否是小麦和玉米在带田种植条件下存在着对钾素吸收的竞争作用,值得进一步研究。
K fertilizer plays a very important role in improving crop yield.However,no research has been done on the effect of K fertilization on a wheat-maize intercropping system in the soils of Hexi Oasis,Gansu Province.The objective of this study was to determine the effect of K fertilizer on crop yield in a wheat-maize intercropping system in Hexi Oasis.A field experiment was conducted in 2006.The experiment included five treatments,namely K0,K75,K150,K225 and K300 kg/hm^2.The results showed that K fertilizer increased wheat and maize yield and also total yield of wheat and maize under the conditions of wheat-maize intercropping system.The wheat yield increased by 5.1%～8.9% compared to the control,and the maize yield increased by 2.8%～8.1% compared to the control,while the total yield of two crops increased by 3.3%～7.8% compared to the control.The total yield was the highest at the rate of K2O 75 kg/hm^2 treatment in which the yield was 12 994 kg/hm^2,the total yield increased by 7.8% compared to the control.K fertilizer increased the K content and K uptake of wheat straw,and they increased by 4.31%～7.84% and 6.2%～9.6% in wheat straw compared to the control,respectively.However,the K content and K uptake in maize straw decreased by 20%～24.86% and 25.7%～28.7% compared to the control,respectively.It seems that there exists competition in potassium absorption between wheat and maize crops under the condition of intercropping system,and this is worth further studying.
出处
《干旱地区农业研究》
CSCD
北大核心
2010年第3期133-136,共4页
Agricultural Research in the Arid Areas
基金
国家科技支撑计划项目(2007BAD46B06)
关键词
钾肥
河西绿洲
小麦/玉米带田
吸钾量
K fertilizer
Hexi Oasis
wheat-maize intercroping
K uptake
