利用套新平旧法更新桑园的研究

REGENERATION OF OLD MULBERRY PLANTATION BY INTER-PLANTING AND GROUND CUNING

在１５年生低干专用湖桑老桑园行间套栽新桑苗选７９２，当年春蚕结束后将老桑贴主干基部平茬，第二年冬将老桑刨除；套栽桑按低干桑常规树型养成法培养。３年试验结果表明，套新平旧法更新桑园累计产叶量较刨除老桑重栽新桑更新桑园产叶量增产４６％。

An old mulberry plantation at the age of 15 was regenerated by inter-plantation method with new variety selection-792.By the end of that spring silkworm raising period, the old mulberry shoots were cut at ground level, and then removed in the winter of the next year.The crown form of mulberry shoots mewly inter-planted was shoped and culfivafed according to thenormal method. The experiment results for three years show that the new inter-planting regeneration method can increase 46% of leaf yield per unit area as compared with the old regeneration method