EFFECT OF ATMOSPHERIC PHENOMENA FACTORS ON THE MILLING QUALITY AND THE APPEARANCE QUALITY OF MEDIUM INDIA HYBRID RICE DURING THE PERIOD FROM FULL HEADING TO MATURITY
灌浆期气象因子对杂交中籼稻米碾米品质和外观品质的影响

Many studies on the susceptibility of grain quality to atmospheric factors during the period from full heading to maturity of inbred rice have been conducted, but there are few for hybrid midseason_rice. The grain yields of hybrid midseason_rice have been raised, but grain quality is very poor, especially the milling quality and appearance quality. This paper explores the relationship between the milling quality and appearance quality and meteorological factors during the period from full heading to maturity of hybrid midseason_rice, and provides theoretical and practical bases for good quality cultivation. The experiment was conducted with 5 different sowing methods, using two hybrids ('II you 7' and '4228A/Jianghui 15') in a randomized block design with 3 replications. Using correlation and path analysis, the results indicated that the rate of head rice, chalky rice and chalkiness among milling and appearance qualities were significantly affected by meteorological factors which include relative humidity, mean daily air temperature, minimum air temperature among meteorological factors in the period of 0_20 days after full heading, but those in the period of 21_30 days after full heading. Suitable meteorological conditions to increase head rice, decrease chalky rice and chalkiness were high relative humidity, lower mean daily air temperatures and minimum air temperature in the period of 0_20 days after full heading.