Mineral nitrogen accumulation and its spatial distribution in soils in dense planting dwarf rootstock apple orchard on the Weibei dry plateau, Northwest China

• Published in: Ying yong sheng tai xue bao Vol. 33; no. 1; p. 97
• Main Authors: Chen, Dong-Kai, Luo, Han, Lyu, Jiao-Rong, Zhang, Bing-Xue, Liu, Dun, Xie, Yong-Sheng
• Format: Journal Article
• Language: Chinese
• Published: China 01.01.2022
• Subjects: China; Fertilizers; Malus; Minerals; Nitrates - analysis; Nitrogen - analysis; Soil; Water - analysis; China; apple orchard; NO; dense planting with dwarf rootstock; plant age; NH; N
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.202201.030

With the rapid development of dense apple tree plantings with the dwarf rootstock cultivation method, determining accumulation and distribution characteristics of soil mineral nitrogen in densely planted orchards with dwarf rootstock is important to enable scientific fertilization of apple orchards. We investigated densely planted apple orchards with dwarf rootstocks and different plant ages (6 a, 9 a, and 12 a). We collected soil samples under trees, between trees, between rows, and at the midpoints between the trees and rows, and examined the accumulation and distribution characteristics of nitrate, ammonium, and mineral nitrogen. The cumulative amount of nitrate in the 0-300 cm soil layer increased with plant age. The difference between orchards with different plant ages was significant and showed the trend 6 a<9 a<12 a. The cumulative amount of nitrate increased from 1729 kg·hm to 3771 kg·hm with increasing plant age. The ammonium content was low for orchards of all plant ages and had little effect on the