经济效益模型在泡桐壮苗培育中的应用

Application of Economic Benefit Model to Cultivating High—strong Paulownia Nursery Stocks

本文在建立泡桐高干壮苗培育措施数学模型的基础上,对影响苗木成本的密度、氮肥和磷肥用量进行经济效益分析,并结合影响产值的种根粗度及埋根日期建立了五元二次经济效益模型。结果表明,该模型回归关系显著,其中磷肥是影响苗木产值、提高经济效益的首要决定因素。以地径、苗高、株数这些已建的数学模型为约束条件。多指标优化结果表明,保苗640～730株/亩,追施尿素51～58kg/亩,基施钙镁磷肥66～100kg/亩,3月下旬埋根,种根直径1.7～2.2cm,可获亩产值1000元以上的高产优质苗木。

Based on the mathematical models of Paulownia high-strong nurserystocks,cultural measures as density,nitrogen and phosphate fertilizer relat-ing to production cost of the stock were analyzed and their model of econo-mic benefit combining factors as planting date and root cutting diameterwere set up.The economic benefit model showed significantly regressionaleffect,phosphate fertilizer being the first factor affecting output value ofthe stock cultivation.When established models of stock diameter,height andnumber are used as binding equations,a stable output of over 1000 yuan permu with good quality stocks can be achieved.