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用 Richards 方程 W=A/(1+Be~(-kt))1/N 配合农垦57号、汕优63号等6个品种(含杂种)强、弱势粒的籽粒增重资料。依弱势粒配得方程的 N 值,将此6个水稻品种的籽粒灌浆状况分为两个类型,即:01的异步灌浆型。并据籽粒生长速率曲线的两个拐点,将籽粒灌浆过程划分为:前,中(盛)、后(至90%A 止)3个期。同时导出:起始生长势 Ro=K/N,生长速率为最大时的日期tmax.G=(1nB-1nN)/K 和最大生长速率 G_(max)等灌浆特征参数。据此对两类品种的籽粒灌浆特征进行分析。结果为:同步灌浆型品种,弱势粒 Ro 值较高,进入灌浆盛期早,全穗籽粒的灌浆盛期均有不同程度重迭,灌浆中、后期生长速率较低;异步灌浆型品种,弱势粒 Ro 值较低,进入灌浆盛期迟,一穗各粒位势的籽粒灌浆盛期相对分散,灌浆中、后期生长速率较高。品种弱势粒的灌浆特征受源、库相对比例影响很大,源相对增强时,Ro 值提高,灌浆盛期提前;源相对减弱时则相反。
The Richards equation W = A / (1 + Be ~ (-kt)) 1 / N was used to study the grain weight gain of strong and weak grains of 6 cultivars including Nongken 57 and Shanyou 63. According to the N value of the equation for the distribution of weak grains, the grain filling status of these six rice cultivars was divided into two types, ie synchronous grouting type with 0 1. According to the two inflection points of the grain growth rate curve, the grain filling process was divided into three stages: before, during and after (to 90% A). At the same time, the initial growth potential Ro = K / N, the maximum growth rate tmax.G = (1nB-1nN) / K and the maximum growth rate Gmax (max) filling characteristics parameters. Based on this, the grain filling characteristics of two types of cultivars were analyzed. The results are as follows: the synchronous grouting type, the inferior grain Ro value is higher, entering the early grain filling stage, the whole filling grain filling period has varying degrees of overlap, filling the late growth rate is low; asynchronous grouting varieties, weak Grain Ro value is low, into the filling of late filling stage, a grain of each grain potential potential of grain filling relatively dispersed, grain filling, late growth rate higher. The grain filling characteristics of the weaker grains were greatly affected by the relative proportion of source and sink. When the source was relatively enhanced, the Ro value increased and the filling period advanced earlier, while the source decreased relatively.