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为实现高粱的调亏灌溉,达到节水但不减产的目的,有必要先了解和掌握高粱在不同生育阶段水分胁迫下产量性状的变化情况,笔者运用二因素四水平的随机区组设计法进行了研究。结果表明:在苗期长历时轻中度及短历时重度胁迫后复水补偿效应明显,节水效率可达50.7%,同CK比较,MMD15、MMD20和MSD10处理产量分别提高4.96%、5.98%、7.18%,差异达5%的显著性,MSD20处理的产量降低1.88%;在拔节期长历时轻中度及短历时重度胁迫后复水补偿效应存在,但不太明显,水分胁迫后的负效应大于补偿效应的正效应,节水效率达37.9%,同CK比较,BMD5~BSD5处理产量依次降低5.38%、7.44%、8.78%、5.4%;差异达5%的显著性,而BSD10和BSD15处理产量降低20.9%和22.45%,达1%的差异显著性;在灌浆期轻中度的胁迫处理,节水效率可达50.0%,千粒重差异不显著,重度胁迫处理,千粒重分别降低20.0%、20.8%和24.4%,其差异达1%显著,导致产量分别降低15.2%、15.7%和16.2%,重度胁迫处理与轻中度胁迫处理相比,千粒重也有1%的显著性。
In order to achieve regulated deficit irrigation of sorghum and achieve the purpose of saving water but not reducing production, it is necessary to understand and grasp the changes of sorghum yield traits under different water stress stages. The author uses two factors and four levels of randomized block design Study. The results showed that the compensation effect of rewatering after long-term mild-moderate and short-term severe stress at seedling stage was significant, and the water-saving efficiency was up to 50.7%. Compared with CK, the yields of MMD15, MMD20 and MSD10 increased by 4.96% and 5.98% 7.18% and 5% respectively. The yield of MSD20 decreased by 1.88%. The compensatory repercussion effect of moderate, moderate and short duration long-term at the jointing stage existed but was not obvious. The negative effect after water stress Which is larger than the positive effect of compensation effect, saving water efficiency of 37.9%. Compared with CK, the yields of BMD5 ~ BSD5 decreased by 5.38%, 7.44%, 8.78% and 5.4%, respectively; the difference reached 5%, while the treatments of BSD10 and BSD15 The yield was reduced by 20.9% and 22.45%, respectively, with a difference of 1%. During light and moderate stress during grain filling, the water saving efficiency could reach 50.0%, the difference of 1000-grain weight was not significant, and that of severe stress treatment and 1000-grain weight were reduced by 20.0% and 20.8% % And 24.4%, respectively. The difference of 1% was significant, which led to 15.2%, 15.7% and 16.2% decrease of yield respectively. Severe stress treatment also had 1% significance of 1000-grain weight compared with light and moderate stress treatment.