Effects Of Nitrogen Levels On Seedling Quality And Effect Of Nitrogen Levels And Seedling Numbers Per Hill On Yield And Quality Of Kenjing 5

In order to study the effect of nitrogen levels on seedling quality and effect of nitrogen levels and seedling numbers per hill on yield and quality of kenjing 5. Kengjing 5 was selected as experimental material to provide theoretical reference and technical support on high yield and well quality. Completely randomized experimental design was adopted. Treatment A was nitrogen amount per square meter in seeding stage, including A1=0g/m2 、 A2=14g/m2 、A3=28g/m2 、 A4=42g/m2 、 A5=56g/m2, and A3 was control. Treatment B was seedling numbers per hill density including B1=1seedling/hill, B2=3seedlings/hill, B3=5seedlings/hill, B4=7 seedlings/hill, B5=9 seedlings/hill and B3 was control. The results are shown as follows:1. The seedling height, leaf age, root length, root number, plant dry weight per 100 plants,root length, rooting ability and root number were maximum by A2=14g/m2. Root length, rooting ability and root number was highly significant correlation to control. Base stem width was maximum by A3=28g/m2. Grain-filling degree was maximum by A1=0g/m2, and significantly higher than control. Plant dry weight per 100 plants was maximum by A5=56g/m2, which was highly significant correlation to control.2. Leaf area index were increased at first and then decreased with seedling numbers per hill increasing in tillering stage and full heading stage, were maximum under B4=7seedlings/hill, but was not highly significant correlation to control. If seedling numbers per hill were changed, leaf area index were also increased at first and then decreased with seedling numbers per hill increasing in the tillering stage and full heading stage and were maximum under A2=14g/m2.3. SPAD in leaf of rare-planting was maximum under five nitrogen levels, and B1=1seedling/hill was significantly higher than control. SPAD in leaf was increased at first and then decreased, the maximum presented under A4=42g/m2. No matter which nitrogen levels and seedling numbers per hill, net photosynthetic rate was all increased at first and then decreased,the maximum were respectively A3=28g/m2 and B2=3seedlings/hill.4. Seedling numbers per hill, grain number per spike, number of spike per square meter,plump grain rate, 1000-grain weight and yield of rice presented a single-peak curve, and the maximum was presented 3 ~ 7seedlings/hill. Grain number per spike, number of spike per square meter and yield were increasing at first and then decreasing with nitrogen level increasing,and the maximum was presented 14 ~ 42g/m2. Most of treatments were lower than A3B3(28g/m2, 5 seedlings/hill), except for A2B4(14g/m2, 7seedlings/hill)and was not highlysignificant correlation to control.5. The grinding quality, protein content and eating comprehensive score presented a single-peak curve and the maximum were respectively 3 ~ 5seedlings/hill and 5 ~ 7seedlings/hill. Appearance quality traits was worsened gradually, which was not highly significant correlation to control. The grinding quality, amylase content, fatty acid and eating comprehensive score were increasing at first and then decreasing and the maximum were presented 14~28g/m2. Under nitrogen levels and potted-seedlings, eating comprehensive score was maximum by A2B4(14g/m2、7 seedlings/hill)but was not highly significant correlation to control.