Effect of Fertilization and Transplanting Density on the Plant Type and Yield of Northern Japonica Liaojing 1402 Grown in Hilly,Sandy Soil Areas
In order to identify the influence of nitrogen fertilizer and planting density on the yield and plant structure of the northern japonica super rice in sandy soil of hilly rice region,three levels of base-tiller nitrogen fertilizer(pure N 155,130,110 kg/ha)and three treatments of planting density(25,20,17 holes/m2)were set with the Ja-ponica super rice variety Liaojing 1402.The effects of N fertilizer and density coupling on rice yield,yield compo-nent,panicle traits,canopy structure,dry matter accumulation and nitrogen use efficiency were studied in sandy soil of hilly region.The results showed that:The N fertilizer and planting density had significant effects on panicles num-ber,secondary panicle branches and yield of the rice,but had no significant effects on grain number,seed-setting rate,1 000-grain weight and primary panicle branches.Increasing planting density significantly increased tiller numbers and effective panicle numbers,but had negative influence on other yield components,and the effect of planting density on yield was greater than that of N fertilizer.Population leaf area index,effective leaf area index and efficient leaf area index were increased by increasing N fertilizer or planting density,while the light transmit-tance decreased significantly with the decline of canopy height.Under the same nitrogen fertilizer level,the effects of planting density on leaf length and leaf width were as follows:basal leaf＜inverted two-leaf＜inverted three-leaf,while the effects on leaf base corner were more complex,as basal leaf＜inverted two-leaf＜inverted three-leaf,and basal leaf＜inverted two-leaf＜inverted three-leaf,respectively,at high nitrogen level.With the increase of nitro-gen application rate,the grain density increased first and then decreased.The nitrogen partial productivity of low N treatment was increased by 8.16％and 25.73％compared with medium N treatment and high N treatment,respec-tively.Our result suggested that the treatments of planting density of 25 holes/m2 and basal tiller N fertilizer amount of 130 kg/ha could be suitable for increasing effective panicle number,tiller panicle formation rate and dry matter,and also had reasonable leaf area index,basal leaf angle and light-interception form at heading stage,which could be beneficial to improve grain yield and N fertilizer utilization efficiency of northern japonica super rice in sandy soil of hilly region.
HillySandy soilNitrogen fertilizerDensityJaponica riceYieldPlant type structure
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万方数据
