Effects of Plant Growth Retardant Lifengling on Lodging Resistance and Grain Yield of Medium Hybrid Rice
The effects of Lifengling, a new plant growth retardant, on lodging resistance and grain yield of seven medium hybrid rice combinations were studied by spraying it 7 ～ 10 days before booting stage. The results showed that there existed significant differences among varieties and Lifengling spraying treatments in plant height, the length of the 2nd, 3rd, 4th and 5th internodes from the base, stem breaking resistance and lodging index. The lodging index was negatively correlated to breaking resistance at a very significant level, and positively correlated to plant height and the length of the 1st, 2nd and 3rd internodes from the base at a very significant level. The treatment by spraying Lifengling shortened greatly the 2nd and 3rd intemodes but elongated the 6th internode, resulting in a higher breaking resistance and a lower lodging index. Application of Lifengling had a varied effect on yield and yield structure with different varieties, but the effect was not very remarkable as a whole.
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维普
