Effects of different nitrogen application rates on growth,yield and nitrogen accumulation of water chestnut
In order to realize the efficient use of fertilizer in the production of water chestnut,the main variety Guiti 3 was used as the experimental material,four nitrogen application gradients were set up,and no nitrogen fertilizer treatments (CK),120 kg·hm-2(N1),240 kg·hm-2(N2)and 360 kg·hm-2(N3)were applied. The growth index,yield and nitrogen content were determined and analyzed comprehensively. The results showed that the application of nitrogen fertilizer could significantly promote the growth and development of water chestnut. The growth indexes such as plant height,tiller number and stolon increased significantly with the increase of nitrogen application,and nitrogen accumulation increased first and then decreased. At N2 level,nitrogen accumulation and yield of all organs reached the maximum. The effects of different nitrogen application rates on nitrogen use efficiency of water chestnut were comprehensively analyzed,and the results showed that the partial productivity of nitrogen fertilizer decreased with the increase of nitrogen application rate. However,the contribution rate of nitrogen fertilizer,agronomic use efficiency of nitrogen fertilizer,absorption and utiliza-tion efficiency of nitrogen fertilizer and physiological use efficiency of nitrogen fertilizer all showed an upward trend,and reached the maximum value in N2 treatment. To sum up,the level of 240 kg·hm-2(N2)is the most beneficial to increase the yield of water chestnut.
Water chestnutNitrogen application rateYieldNitrogen accumulationNitrogen use efficiency
万方数据
维普
