| Cite this article: | 李荣承,万书勤,李晓彬,等.浅埋地下滴灌施肥灌溉对苜蓿生长和产量的影响[J].灌溉排水学报,0,():-. |
| LI Rongcheng,WAN Shuqin,LI Xiaobin,et al.浅埋地下滴灌施肥灌溉对苜蓿生长和产量的影响[J].灌溉排水学报,0,():-. |
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| Effects of fertigation with shallow subsurface drip irrigation on growth and yield of alfalfa |
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LI Rongcheng, WAN Shuqin, LI Xiaobin, KANG Yaohu
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Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographical Sciences and Natural Resources Research,CAS
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| Abstract: |
| Abstract:【Objective】To obtain the fetigation schedule suitable for shallow subsurface drip irrigation of alfalfa in Hulunbuir area, 【Method 】Field experiment was conducted to establish different fertilization rates of 30%, 50%, 70%, 90%, 110% and 130% based on the high yield fertilization scheme of local alfalfa (240 kg/hm2 of diammonium phosphate and 150 kg/hm2 of potassium sulfate per alfalfa crop). The effects of different fertilization rates on soil water and nutrient distribution, soil nutrient content changes, alfalfa growth, fresh grass yield, fertilizer productivity, and irrigation water use efficiency were studied.【 Results 】① It was found that under the condition of shallow subsurface drip irrigation, when the threshold of the soil matrix potential was -20 kPa at a depth of 20 cm from the surface (10 cm below the drip emitter directly), the soil moisture content in the 0-40 cm soil layer was high, and the concentrations of nitrate nitrogen, ammonium nitrogen and available phosphorus in the 0-20 cm soil layer were high. This provided a good soil moisture and nutrient condition for alfalfa growth and development. ② Compared with the basic soil nutrient concentration before the experiment, after 1 and 2 years of fertigation, the nitrate nitrogen concentration in the 0-10 cm soil layer increased, while the nitrate nitrogen concentration in the soil layer below 10 cm decreased. For the 110% and 130% treatments, the concentration of ammonium nitrogen in the 0-60 cm soil layer increased significantly, and the concentration of available phosphorus in the 0-30 cm soil layer increased. For the 50% treatment, the concentration of ammonium nitrogen and available phosphorus in the 0-60 cm soil layer remained unchanged. ③ There were no significant differences in stem diameter, number of branching, stem-leaf ratio and other growth indices of alfalfa on different fertilization ratios. With the increase of the fertilization ratio, the alfalfa fresh yield had a tendency to increase linearly, the fertilizer productivity decreased linearly, and the irrigation water use efficiency had a tendency to increase linearly.【 Conclusion 】Considering the changes of soil nutrient content, fertilizer productivity and fresh yield of alfalfa, alfalfa with 1~3 years old can obtain high yield and high water and fertilizer use efficiency when the fertilizer application rate is 50% of the local recommended fertilizer application amount for high yield of alfalfa. |
| Key words: artificial pasture; Shallow subsurface drip fertigation schedule; irrigation water use efficiency; fertilizer productivity |
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