乙霉合剂对春玉米干物质积累和茎秆形态的调控

Regulation of Dry Matter Accumulation and Stem Shape of Spring Maize by EM-Compounded Agent

在高密度种植条件下,玉米容易出现倒伏、空秆、小穗。使用目前已有的调节剂防倒伏,容易影响穗部发育,降低产量。在大田条件下,玉米六展叶时喷施乙霉合剂,研究其化控效应。试验表明,该调节剂缩短了穗下部节间长度,降低了玉米的株高、穗位高、穗高比,增强了植株抗倒伏能力。促进了乳熟期以后茎秆中干物质向子粒的转运,并增加了茎秆干物质向子粒的转运率,降低了乳熟期后叶片干物质积累速率,延缓了叶片的衰老,子粒灌浆速率高于对照,增加了经济系数,提高了产量。

Maize plants tend to lodge and ears tend to be small under high-density. Although current growth regulators in market can prevent lodging, they often affect spike development of maize and thus reduce yield. This study sprayed a new growth regulator, i. e. EM-Compounded Agent at the sixth-leaf stage under field conditions to understand the regulatioin mechanisms. The results indicated that this regulator could decrease plant height, shortened ear height, and the length of internodes below ear, and thus promoted the lodging resistance. Also it did not have negative effects on diameter of basal stem and stem density. Additionally, it could adjust process of dry matter accumulation, accelerate nutrition transport and increase yield of maize.