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山药块茎的形成与膨大依赖于贮藏物质的积累,而贮藏物质的合成又依赖于光合作用。然而,生产上常有人担心地上部生长过旺,影响地下块茎膨大,于藤蔓爬满架顶后反复砍割。结果事与愿违,反因营养体不足,严重制约了地下块茎的膨大。为切实有效地解决这一难题,笔者于1993年在射阳县农科所进行了试验探索。 研究表明:山药生长盛期地上部无论怎样旺长,也甭砍割茎蔓,只需适时适度使用多效唑2～3次,
The formation and enlargement of yam tubers depend on the accumulation of stored substances, which in turn depend on photosynthesis. However, people often worry about the production of excessive growth of the upper part of the underground tubers affect the expansion of the vines repeatedly covered after the top cut off. The result is contrary to expectations, due to lack of nutrition, severely restricted the expansion of underground tubers. In order to effectively solve this problem, the author conducted a pilot study in Sheyang County Agricultural Science Institute in 1993. Studies have shown that: the growth of yam during the shoots no matter how prosperous, but also cutting cut stem vine, only appropriate and timely modest use of paclobutrazol 2-3 times,