Grain Filling And Quality Formation Study On Waxy Maize

The differences of grain filling and quality formation among 15 waxy maize varieties and that effected by high, middle, low density and fertilizer were studied on the experiment field of Crop Cultivation Physiology Key Laboratory of Jiangsu Province, Yangzhou University. The main results were as follows:1. There were significant differences of fresh ear yield and grain yield among different treatments. The component that affected fresh ear yield most was the fresh ear weight. The main components that affected grain yield were 100-grain-weight, grain number per ear and fresh grain weight per fresh ear weight. The fresh ear yield was mainly determined by the fresh ear weight in different density and fertilizer. The grain yield was mainly determined by the grain number per ear, 100-grain-weight, ear number per mu in different density and fertilizer. The fresh ear yield was positive relation to the grain yield.The dynamic changing of fresh ear weight and fresh grain weight after silking was one-peak-curve. The biggest fresh ear weight was positive relation to the fresh ear weight in different treatments. The dynamic changing of ear weight and grain weight after silking could be simulated by Richards equation well. The parameters of R0. Gmax, V2, T2 were mainly determined the fresh ear weight and TmaxG, D, V2, T2 were the mainly determined the grain weight of varieties. The grain yield was main determined by Gmax, D, V2, and T2 in different density and fertilizer treatments. The water content of fresh ear and grain were straightly decreased with the days after silking and decreaserates had no correlations with fresh ear weight. The grain volumes were increased with the day after silking. There were positive relation between the grain volume and 100-grain-weight in different varieties. The density and fertilizer had little effects on the grain volumes.2. There were significant differences of the ear taste values in different treatments. The sequence of taste components was ear appearances, waxy, skin, color, smell, delicates and ear flavor in different varieties experiment and ear appearances, waxy, skin, color, ear flavor, delicates and smell in different density and fertilizer experiment. The relation of ear taste values and fresh ear yield in different treatments could be divided into four types: high taste values and high fresh ear yield, high taste values and low fresh ear yield, low taste values and high fresh ear yield, low taste values and low fresh ear yield.3. The Richards equation could be used to match the grain starch content changes in different treatments. The parameters of R0, D, V2 were main determined the grain starch content in different varieties. The grain starch content was main determined by Gmax, D, T2 and V2 in different density and fertilizer experiment. The grain starchcontent was 2-3 days later than the grain weight to T2 stage.The dynamic decrease of grain sugar content after silking was "fast-low-fast-low"curve. There were significant differences in different varieties. The fresh ear grain sugar content could be increased obviously by fertilizer and there were no significant differences of grain sugar content in different density levels.The dynamic changing of grain protein content with days after silking could be simulated by Y=a X ebx equation. The grain protein content were mainly determined by parameter b in different varieties, by parameter a values in different fertilizer level. There was no significant effect of density on the grain protein content.