勾股定理在水稻高产防倒栽培中的应用

APPLICATION OF PYTHAGOREAN THEOREM IN HIGH-YIELD AND ANTILODGING CULTURE OF RICE

水稻到伏的原因甚为复杂,且多以风雨为起因。通过多年的观察,笔者发现水稻遭受风雨袭击时,倒伏田块的实际行距<理论行距;未倒伏田块的实际行距≥理论行距。理论行距=(剑叶长~2-颈穗长^(2**))^(1/2)。这一结论,符合勾股定理,它极简明的表达出品种、栽培和气候相互协迫与倒伏的关系;为解决水稻高产与倒伏的矛盾,指导大田生产及品种选育提供了理论参数。

Factors causing rice plant lodging are rather complex, but tie main origin is wind and rain in most cases. On basis of observation for many years, the authors find that it reserves the following relations: in lodging rice field,practical RS<theoratical RS; in unlodging rice field, pratical RS≥theoratical RS, Theoratical RS=(FL^2-EL^2)^(1/2), Here by RS mean row spacing; FL—the flag leaf length; EL—ear-neck length, i.e. the length from panicle top to ear of flag leaf. This conclusion tallies with Pythagorean theorem, which states clear relationship of varieties, culture methods and climate to plant lodging. It provides theoretical parameters for resolving the contradiction of high yielding to plant lodging, and for instructing field production and variety selection.