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为研究不同播量与水肥(N、P、K)耦合效应对秋闲田饲用谷子水分利用率的影响,以‘冀谷18’为材料,采用五元二次回归正交旋转组合设计进行盆栽试验。结果表明:水分、磷肥等对水分利用率有重要影响,其中水分对水分利用率的影响最大,其次是磷肥,氮肥、钾肥、播量等没有明显影响;播量与水肥耦合的显著项及其强弱顺序为:钾肥+播量>氮肥+磷肥>水分+磷肥>水分+播量>水分+钾肥,其他各项无明显影响。构建了数学模型y=44.26-1.311x_1-2.298x_2-3.682x_3-6.401x_4- 34.540x_5+0.273x_1x_3+0.118x_1x_4+0.843x_1x_5-1.948x_2x_3+6.631x_4x_5,明确了以经济效益为考核指标的最优方案:土壤含水量保持10%、饲用谷子播量15 kg/hm~2。该方案水分利用率为26.24 g/kg,干草产量折合13980.90 kg/hm~2,经济效益为13830.90元/hm2,较产草量最高的优化组合增收3063.73元/hm~2,增幅22.15%,较水分利用率最高的优化组合增收6215.15元/hm~2,增幅44.94%,为秋闲田饲用谷子生产实践提供了理论依据和技术支撑。
In order to study the effects of coupling effects of different sowing rates on water utilization efficiency (N, P, K) of autumn fallow field forage millet, using ’Ji Gu 18’ as material, quadratic quadratic regression orthogonal rotation combination design Pot experiment. The results showed that water and phosphate fertilizer had an important effect on water use efficiency, of which water had the greatest effect on water use efficiency, followed by phosphate, nitrogen and potassium fertilizers, sowing no significant effect; The order of strength is: potash + sowing rate> nitrogen fertilizer + phosphate fertilizer> water + phosphate fertilizer> moisture + sowing rate> water + potassium fertilizer, and other items have no obvious effect. The mathematical model is constructed, y = 44.26-1.311x_1-2.298x_2-3.682x_3-6.401x_4-34.540x_5 + 0.273x_1x_3 + 0.118x_1x_4 + 0.843x_1x_5-1.948x_2x_3 + 6.631x_4x_5, which defines the optimal plan with economic benefits as the evaluation index : 10% of soil moisture content, feed grain yield 15 kg / hm ~ 2. The water use efficiency of the program was 26.24 g / kg, hay yield was 13980.90 kg / hm ~ 2, economic benefit was 13830.90 yuan / hm2, and the optimal combination of the planted grass yield increased 3063.73 yuan / hm2, an increase of 22.15% The optimal combination of water use efficiency increased 6215.15 yuan / hm ~ 2, an increase of 44.94%, which provided the theoretical basis and technical support for the production practice of forage millet in Autumn leisure field.