| Effects of nitrogen fertilizer on the photosynthetic characteristics and nutrient utilization of drip irrigated silage maize by sequential cropping in north Xinjiang |
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| DOI：10.16302/j.cnki.1000-7601.2015.02.029 |
| Key Words: drip irrigation sequential cropping silage maize nitrogen fertilizer photosynthetic characteristics yield |
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| Abstract: |
| In order to investigate the effects of nitrogen (N) fertilizer on the physiological indexes of drip irrigated silage maize by sequential cropping in north Xinjiang, to increase N fertilizer utilization efficiency, through the field plot experiments have researched the effects of photosynthetic characteristics and soil NH4+-N distribution under the layout pattern of one row with one lateral pipe and different N fertilizer treatments (i.e., 100, 170, 240, 310 kg·hm-2 and 385 kg·hm-2). The results showed that: For different N fertilizer treatment condition, the daily change curves of the net photosynthetic rate of the leaves and transpiration rate of the sequential cropping maize displayed a single peak type. Holistically, soil total NH4+-N content decreased at first and then increased with increasing the N application. The yield increased at first and then decreased with increasing N application. Through the comprehensive analysis, we think under the layout pattern of one row with one lateral pipe, the N fertilizer application treatment of 240 kg·hm-2 was the best effect of water-N coupling with the lowest soil total NH4+-N content, highest yield and water use efficiency of the leaf, and a relatively high net photosynthetic rate. |
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