不同栽培条件下巴西陆稻的产量及其经济性状研究

Studies on the Yield and Economic Characters of Brazilian Upland Rice (IAPAR9) Under Different Cultivation Conditions

对巴西陆稻（ＩＡＰＡＲ９）从灌溉时期、施氮量及配比、土壤含水量三个方面进行了产量及其经济性状研究。结果表明：（１）不同生育时期灌溉，其产量达显著差异，产量大小顺序为长期灌水＞孕穗期灌水＞抽穗期灌水＞分蘖期灌水；（２）ＩＡＰＡＲ９的施氮量及配比以６６７ｍ２１２ｋｇ纯Ｎ（６０∶２０∶２０）为最优；（３）巴西陆稻的耐旱性强，生长发育的水分极限为土壤持水量的３５．９％，最适宜、利用率最高的土壤水分为土壤持水量的９０％左右。

The yield and economic characters of IAPAR9, in terms of the irrigation periods, the amounts and proportions of N-fertilizer application and the water contents of soil, were investigated systematically. The results showed that: (1)the yields of different irrigation periods reach remarkable statistical level, the order of them from high to low is: basin irrigation, boot stage, heading stage and tillering stage; (2)the optimum amount of N fertilizer application is 180kg pure N /hm 2, with its proportions being 60∶20∶20; (3)the drought endurance of IAPAR9 is strong, the minimum water content of the soil for the growth and development of IAPAR9 is 35.9% of the moisture holding capacity of the soil, and the optimum water content is over 90% of the moisture holding capacity of the soil.