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本文是根据昆明市官渡区龙泉综合试验示范区近年来就水稻栽培进行的试验和总结写成的。这个综试区位于昆明北郊,总耕地面积二万四千多亩。其中稻田二万零二百七十九亩,为官渡区山坝兼有的公社。坝区海拔约一千九百公尺,年平均气温14.6℃。水稻生育期间,历年五月平均18.4℃,六月19.3℃,七月19.5℃,八月18.8℃,温度不高,只相当于水稻抽穗扬花的临界温度。又兼之麦田比例达60％以上,形成了大面积的水稻迟栽。正当八月上中旬水稻抽穗扬花之际,气温下降迅速,常常影响水稻产量不稳不高。整个七十年代,单产都在700斤左右徘徊,一九七四年后期遇上严重的低温冷
This article is based on experiments and summarizations of rice cultivation conducted in recent years in Longquan Comprehensive Experimental Demonstration Zone of Guandu District, Kunming. The comprehensive test area is located in the northern suburbs of Kunming, with a total area of more than 24,000 mu. Among them, there are 20,279 acres of paddy fields, which are communes owned by Shanba in Guandu District. The dam area is about 1,900 meters above sea level with an annual average temperature of 14.6 ℃. During the period of rice growth, the average temperature in May was 18.4 ℃ in June, 19.3 ℃ in June, 19.5 ℃ in July and 18.8 ℃ in August, which was only equivalent to the critical temperature of heading and flowering of rice. In addition, the proportion of wheat fields reaches 60% or more, forming a large area of late rice planting. Just in mid-August paddy heading heading to China, the temperature dropped rapidly, often affect the yield of rice is not stable. Throughout the seventies, yields were hovering around 700 jin and in late seventy-four severe cold cold