The Soil-N Dynamic Rules and Their Relationship with Nitrogen Nutrition of Yali-pear Tree at Different Application Times

doi:10.3321/j.issn:1000-7091.1993.01.017

Abstract

Abstract: The dynamic changes of the quick-acting nitrogen and the fertilizer nitrogen and their relationship with nitrogen nutrition of Yali-pear tree at different application times were studied, taking the three-year-olds Yali-pear tree as materials and labelling them with 16N.The results showed that the influence of the application time on NH4+-N content in the soil was less and the influence on NO3--N content was greater.There were two NO3--N peaks of the nonapplication and autumn application treatments, but there was only one peak of spring and summer application treatments.The NO3--N peaks of the autumn and spring treatments appeared one to two months earlier compared with the control, and their peaks were 3.6 to 4.4 times higher than that of the control.The height of the NO3--N peaks were ranged in following order: autumn application>spring application >summur application.The results also indicated that the fertilizer nitrogen was disrtributed within 0-50cm soil layer, and the total nitrogen in the tree was highly related with NO3--N content in the root system soil layer.

Key words: ¹⁵N tracing, Yali-pear tree, Fertilizer application time, Nitrogen, Nutrition of Vali-pear tree, Dynamic change

Chen Liang, Gao Zhanfeng, Xu Xiaorong, Zeng Yanjun, Lin Yuyi, Gong Yunchi, Xu Ji;e. The Soil-N Dynamic Rules and Their Relationship with Nitrogen Nutrition of Yali-pear Tree at Different Application Times[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1993, 8(1): 83-87. doi: 10.3321/j.issn:1000-7091.1993.01.017.

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