桑园因管理不当,造成缺株多、枝条短、叶片少、经济效益差。对这样的低产桑园可采取以下办法加以改造。 (一)套栽更新土地平坦的低产衰败桑园,可在桑行中套栽无干密植桑。栽前深翻土壤,开沟施基肥,亩栽1500～2000株。春蚕4龄期提前夏伐老桑,夏秋期重采叶,减少遮荫,加强新桑栽培,控制采叶,促进生长,入冬后再挖除老桑。 (二)去老补新树势衰老、缺株严重、叶量极低、土地又不平整的桑园,可预先挖除老桑,而后整地施肥,选栽良种更新,亩栽1000～1200株为宜。 (三)截干补栽树龄较小,缺株较多的桑园,按亩栽1500株左右的密度(包括原有桑在内),在桑 Mulberry improper management, resulting in lack of more strains, short branches, fewer leaves, poor economic efficiency. For such low-yield mulberry can take the following measures to be transformed. (A) set of planted land to update the flat low-yield decay mulberry, mulberry can be planted in the dry without dense mulberry. Deep soil before planting, open ditch base fertilizer, planted 1500 ~ 2000 acres. The fourth instar of cotton silkworm ahead of the summer old mulberry, summer and autumn re-harvest leaves, reduce shade, strengthen the cultivation of new mulberry, control the mining leaves, promote growth, and then dig the old mulberry after winter. (B) to the old foliage tree aging, serious shortage of leaves, the amount of leaves is extremely low, the land is not smooth Mulberry, you can pre-dig old mulberry, and then site preparation and fertilization, planting selection of new varieties, planted acres of 1000 ~ 1200 It is advisable. (C) truncated stem replantation smaller, lack of more mulberry trees, planting about 1500 acres per plant density (including the original mulberry included), in the mulberry