Effects Of Nitrogen Fertilizer On Wheat Starch Accumulation Characteristics And Yield

To identify the effects of nitrogen fertilizer on wheat plant growth and grainyield and starch properties, and the differences of response to nitrogen rate werecompared between the common wheat and waxy wheat. Field experiment wasconducted to study responses of different levers of nitrogen to the plant growth, grainyield the content of amylopectin and amylase and starch granule size distribution withLX987and N50222of waxy. Two treatments were designed with nitrogen of100kgN/hm2and200kgN/hm2, respectively. The normal condition was taken as thecontrol. The results indicated that the per unit area spikes of two varieties (or lines)were increased with the increasing of nitrogen rate. On a scale of0~200kgN/hm2, thepercentage of earbearing tiller of N50222increased gradually along with the nitrogenfertilizer which was different with the trend of the first increased then drop of LX987.The grain number of LX987emerged the trend of the first increased then drop in arange of nitrogen which was different with N50222, and the kernels per spike ofN50222was bigger than the LX987’s. The grain-filling process presented the "S"type curve. The1000-grain weight of wheat was negative correlated with nitrogen. Inthe range of0~200kgN/hm2, the wheat of N50222production increased with theincreasing the amount of nitrogen, this was different with the trend of decreasing afterincreasing. Amylose content in the grain endosperm of N50222was less than0.9%,the total starch exceeded the LX987. The content of total starch, amylose of twovarieties declined after increased the nitrogen. The starch size distribution of wheatemerged bimodal curve. The starch granule size distribution, the number of starchgrain, the volume and surface area of grain, grain weight are all affected by differentlevers of nitrogen. What’s more, it changed the ratio of internal compositions ofwheat starch.