摘要
为了通过桑园科学施肥提高四川丘陵蚕区的桑树产叶量与生产效益,采用现代肥料二次回归"3414"设计方案,分别以桑叶产量为目标函数,选取对桑树生长发育影响较大的肥料元素氮(N)、磷(P)、钾(K)的施肥水平为调控因子,模拟桑树产叶量与N、P、K之间的回归关系。得到三元二次、二元二次、一元二次共3种7类N、P、K肥料效应函数,各类型函数获得最佳桑树产叶量的肥料因素权重表现为K>PK>P>NPK>NK>N>NP,产投比的肥料因素权重表现为K>PK>NPK>P>NK>NP>N。其中三元二次肥料效应函数(Y=20 313+0.25X1+43.48X2+34.47X3-0.01X12-0.14X22-0.06X32+0.05X1X2+0.02X1X3-0.07X2X3,其中X1、X2、X3分别为N、P、K肥料因子)为全因子模型,可作为桑园的推荐施肥方案。单因素效应分析显示K肥对桑树产叶量及产投比的影响最大,因而在所有模拟的函数中K肥因子的一元二次肥料效应方程(Y=25 002.27+44.728X3-0.084X32)获得的最佳产叶量和产投比最高,用600.00 kg/hm2 N、210.00 kg/hm2 P2O5、254.33 kg/hm2 K2O的最佳施肥方案,获得的桑树最佳经济产叶量达到30 945.00 kg/hm2,投入的肥料价值为4 403.65元/hm2,产投比高达17.57。该最佳施肥方案通过生产实践验证后,可为四川丘陵蚕区高产桑园建设提供参考。
In order to increase mulberry leaf yield and production efficiency in hilly areas of Sichuan Province through scientific fertilization,＂3414＂,a quadratic regression design for modern fertilization,was employed to simulate the regression relationship between mulberry leaf yield and major fertilizer elements including nitrogen（N）,phosphor（P） and potassium（K） among which mulberry leaf yield was the objective function and N,P and K were the regulatory factors to fertilization level.As a result,7 types of three-factor,two-factor and one-factor quadratic effect functions to N,P and K fertilizer elements were established.The weight of fertilizer factors having optimum mulberry leaf yield from all types of functions was expressed as KPKPNPKNKNNP.And the weight of fertilizer factors having ratio of leaf yield to input was expressed as KPKNPKPNKNPN.Among them,the three-factor quadratic effect function（Y=20 313＋0.25X1＋43.48X2＋34.47X30.01X12-0.14X22-0.06X32＋0.05X1X2＋ 0.02X1X3-0.07X2X3,X1,X2,X3 referred to N,P,K fertilizer factor respectively） was a model containing all factors,being a recommended fertilization design for mulberry field.Single factor effect analysis indicated that K fertilizer had the highest influence to mulberry leaf yield and ratio of leaf yield to input.Therefore,among all the simulation functions,the one-factor quadratic fertilizer effect function of K fertilizer factor（Y=25 002.27＋44.728X3-0.084X32） produced the optimum leaf yield and highest ratio of leaf yield to input.The best fertilization design which used 600.00 kg/hm2 N,210.00 kg/hm2 P2 O5 and 254.33 kg/hm2 K2 O produced the highest leaf yield as 30 945.00 kg/hm2 and the ratio of leaf yield to input as 17.57.The optimum fertilization design after confirmation in productive practice would provide good reference for establishing high yield mulberry field in Sichuan hilly areas.
出处
《蚕业科学》
CAS
CSCD
北大核心
2011年第3期526-531,共6页
ACTA SERICOLOGICA SINICA
基金
现代农业产业技术体系建设专项(蚕桑)
四川省农业科学院优秀论文基金项目(No.2011JYGC-LWJJ-07)
关键词
桑树
高产
平衡施肥
施肥效应函数
Mulberry
High yield
Balanced fertilization
Fertilizer effect function
