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桑园因肥水管理不当,或防治病虫不力等原因,致使桑树衰弱,可采取以下改造措施。 1.套栽更新。对土地平坦的低产衰败桑园,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龄期对老桑提前夏伐,夏秋季实行重采叶,减少对幼树的遮荫,加强新桑培管,控制新桑用叶,促其生长,入冬后再挖除老桑。 2.去老补新。树势衰老、缺株很多、产叶量低、土地又不平整的桑园,可预先挖除老桑,而后整地施基肥,按亩栽1000～1500株更新。 3.(?)补栽。树龄较小,缺株较多的低
Mulberry for improper management of fertilizer, or prevent pests and other reasons, resulting in weak mulberry, can take the following transformation measures. 1. Set of planted updates. Low-yield decay on the land Mulberry Park, in the Mulberry line without planting dense mulberry. Deep soil before planting soil ditching base fertilizer, acre planted 1500 ~ 2000. In the fourth instar of cotton silkworm, the old mulberry was planted in summer, and the summer and autumn were reworted to reduce the sapling of the sapling. The new mulberry tube was strengthened and the new mulberry leaf was controlled to promote its growth. . 2 to the old fill new. Tree aging, a large number of missing strains, leaf yield is low, the land is not smooth mulberry, mulberry sale, the excavation of the old mulberry before, and then site preparation of base fertilizer, acres planted 1000 ~ 1500 strains updated. 3. (?) Replacement. Small age, lack of more strains