渭北旱塬毛叶苕子不同翻压量下养分变化特征

Nutrient Release Characteristics of Different Vicia villosa Green Manure Applications in Weibei Arid Plateau

采用尼龙网袋法研究了低(30000 kg/hm^(2))、中(45000 kg/hm^(2))、高(52500 kg/hm^(2))3个翻压量下毛叶苕子的干物质养分变化特征。结果表明,随着时间推移不同翻压量毛叶苕子的干物质质量减少量与含水量变化趋势类似,均呈逐渐降低趋势;氮、磷、钾养分累积释放量则相反,均呈逐渐增加趋势。至试验结束时各处理干物质的最终含水量依次为55.13%、56.68%和52.74%,氮养分累积释放量依次为2.83、4.36、5.23 g,磷养分累积释放量依次为0.37、0.52和0.64 g,钾养分累积释放量依次为3.96、5.38和6.66 g。毛叶苕子营养元素释放量表现为钾>磷>氮,增加翻压量会改变毛叶苕子整体的养分释放量。

The nutrient release characteristics of V.villosa were tested with different application amounts.Nylon net bags(30 cm×20 cm)were used to assess three application treatments:low(30000 kg/hm^(2)),medium(45000 kg/hm^(2))and high(52500 kg/hm^(2)).The results showed that the variation trends of dry matter mass reduction and water content of V.villosa with different rolling amounts were similar over time,and they all showed a gradually decreasing trend.The accumulation and release of nitrogen,phosphorus and potassium nutrients were opposite,showed a gradual increasing trend.At the end of the experiment,the final water content of dry matter in each treatment was 55.13%,56.68%and 52.74%,the cumulative release of nitrogen was 2.83,4.36 and 5.23 g,the cumulative release of phosphorus was 0.37,0.52 and 0.64 g,and the cumulative release of potassium was 3.96,5.38 and 6.66 g.The nutrient release order of Vicia villosa was potassium>phosphorus>nitro-gen,and the increase of turning pressure would change the overall nutrient release of Vicia villosa.