稻米垩白度与籽粒灌浆特征参数的关系研究

STUDIES ON THE RELATION BETWEEN CHALKINESS AND GRAIN-FILLING PARAMETERS IN RADDY IN PADDY RICE

Six indica fice varieties were sown at three seasons so that their grains were allowed to befilled under different temperatures.the filling grains of each treatment were weighed dynami-cally and the grain-filling processes were simulated with the Rechaxds equations. From eachequation five grain-filling parameters,i.e. the initial filling potential(R0),the fiiling dura-tion(t),the average filling rate(v),the maximum filling rate(vm)and days from heading tothe date of vm(tm),were derived. Studies showed that the relations between chalkiness(y)and each of the five parameters(x)could be quantified with parabolas in which chalkiness wasreferred to as dependent variable. Each filling parameter had an optimum value at which thechalkiness could reach its minimum level.It seemed that the chalkiness could more or less bereduced by adjusting the grain filling patterns through appropriate techniques.