| Effect of K fertilization on crop yield and K uptake in a wheat-maize intercropping system in Hexi Oasis |
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| DOI：10.7606/j.issn.1000-7601.2010.03.24 |
| Key Words: K fertilizer Hexi Oasis wheat-maize intercroping K uptake |
| Author Name | Affiliation | | HU Zhiqiao | Cansu Academy of Agricultural Sciences, Lanzhou, Cansu 730070，China
2.Northwest A&F University, Yangling，Shaanxi 712100, China | | BAO Xingguo | Cansu Academy of Agricultural Sciences, Lanzhou, Cansu 730070，China | | ZHANG Jiudong | Cansu Academy of Agricultural Sciences, Lanzhou, Cansu 730070，China | | MA Zhongming | Cansu Academy of Agricultural Sciences, Lanzhou, Cansu 730070，China |
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| Abstract: |
| K fertilizer plays a very important role in improving crop yield. However, no research has been done on the efect of K fertilization on a wheat-maize intercropping system in the soils of Hexi Oasis, Gansu Province. The objec-tive 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, K225and K300 kg/hm2. 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 K20 75 kg/hm2treatment in which the yield was 12 994 kg/hm2, 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. |
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