摘要
为研究不同播量与水肥(N、P、K)耦合效应对河北秋闲田饲用谷子(Setaria itlica)产草量的影响,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,通过建立饲用谷子干草产量(Y)与土壤含水量(x1)、N(x2)、P(x3)、K(x4)以及播量(x5)之间的数学模型,模拟寻优。结果表明,水分、播量、磷肥、钾肥等对产草量有重要影响,其中,水分对产量的影响最大,其次是播量、磷肥、钾肥;播量与水肥耦合的显著项及其强弱顺序为:水分+播量>钾肥+播量>氮磷耦合>水氮耦合>水磷耦合;其他各项没有明显影响。构建了数学模型Y=20 543.756-565.570x1-39.942x2-23.102x3-38.470x4-151.877x5+1.052x1x2+1.604x1x3+12.953x1x5-0.173x2x3+0.737x4x5-2.292x52,其决定系数R2=0.788,显著值Sig.=0.000<0.01,差异极显著,FLf=0.464<F0.1=2.193,失拟性不显著,表明该模型预测结果可靠程度较高。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15kg/hm2。该方案干草产量为14 037.15kg/hm2,经济效益为13 887.15元/hm2,较最优组合增收3 288.98元/hm2,增幅23.68%。为秋闲田饲用谷子生产实践提供了理论依据和技术支撑。
The paper studied the effects of seeding rate,water and fertilizer （N,P,K）coupling on grass yield of fodder millet （Setaria itlica cv.Jigu No.18）grown in autumn fallow field.A orthogonal rotation combination with five factors was designed in pot experiment.The mathematical model between fodder millet hay yield （Y ） and soil moisture content （x 1 ）,N （x 2 ）,P （x 3 ）,K （x 4 ）and seeding rate （x 5 ）was established to simulate opti-mization.The results showed that soil moisture,seeding rate,phosphate （P）fertilizer and potassium （K）fertil-izer had important effects on grass yield.The greatest influence on yield was soil moisture,which was followed by seeding rate,P and K.The order coupling strength was soil content - seeding rate〉K-seeding rate 〉 N -P 〉 soil moisture-N 〉soil moisture -P.The mathematical model,Y =20 543.756 -565.570x 1 -39.942x 2 -23.102x 3 -38.470x 4 - 15 1.877x 5 ＋ 1.052x 1 x 2 ＋ 1.604x 1 x 3 ＋ 12.953x 1 x 5 - 0.173x 2 x 3 ＋ 0.737x 4 x 5 - 2. 292x 25 （R 2 =0.788.P 〈0.01,F Lf =0.464 〈 F 0.1 =2.1 93）was established.The optimum soil moisture and see-ding rate were 10% and 15 kg/hm2 .And the estimated highest hay grass yields and economic benefit were 14 037.15 1 0 kg/hm2 and 13 887.15 yuan/hm2 ,the economic benefit could be increased by 23.68% （3288.98 yuan/hm2 ）compared to the best combination in experiment.
出处
《草原与草坪》
CAS
CSCD
2016年第2期34-43,共10页
Grassland and Turf
基金
农业部公益性行业科研专项"牧区饲草饲料资源开发利用技术研究与示范"(20120304201)资助
关键词
秋闲田
饲用谷子
播量
水肥耦合
产草量
autumn fallow field
forage millet
seeding rate
water and fertilizer coupling
grass yield
