不同水肥组合对宁夏干旱风沙草原区固定喷灌紫花苜蓿土壤含水量及品质的影响

Effects of Different Water and Fertilizer Combinations on Soil Moisture Content and Quality of Alfalfa with Fixed Spray Irrigation in Drought Sandy Savanes Region of Ningxia

[目的]研究不同水肥组合对宁夏干旱风沙草原区固定喷灌紫花苜蓿土壤含水量及品质的影响。[方法]通过田间试验,对不同水肥组合下固定喷灌紫花苜蓿土壤含水量、作物水分利用效率和品质等指标进行综合分析。[结果]在沙土条件下,当苜蓿根区土壤含水量低于6.3%时必须灌水,灌水至土壤含水量在12.0%以上,每次灌水至40~60 cm;处理T 4作物水分利用效率最高,产量较高,粗蛋白含量最高,适口性较好。[结论]宁夏干旱风沙草原区最优的水肥组合方式为灌溉定额3600 m 3/hm 2,施肥量N 75.0 kg/hm 2、P 2O 5105.0 kg/hm 2、K 2O 90.0 kg/hm 2。

[Objective]To study the effects of different water and fertilizer combinations on soil moisture content and quality of alfalfa under fixed spray irrigation in drought sandy savanes region of Ningxia.[Method]Through field experiment,the soil moisture content,crop water use efficiency and quality of alfalfa with fixed spray irrigation under different water and fertilizer combinations were comprehensively analyzed.[Result]The result indicates that,under sandy soil conditions,when the soil moisture content in alfalfa root zone was lower than 6.3%,irrigation must be carried out until the soil moisture content was more than 12.0%,and each irrigation depth was 40-60 cm.T 4 treatment had the highest water use efficiency,higher yield,the highest crude protein content and good palatability.[Conclusion]The best combination of water and fertilizer in drought sandy savanes region of Ningxia was as follows:the irrigation quota of 3600 m 3/hm 2,the amount of N,P,K fertilizer of 75.0,105.0 and 90.0 kg/hm 2 respectively.