| Effects of drip technical parameters and fertilization cycle on spatial and temporal distribution of nitrate nitrogenin apple root-zone soil |
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| DOI：10.7606/j.issn.1000-7601.2022.03.10 |
| Key Words: apple orchard drip fertigation arrangement of drip lines emitter spacing fertilization cycle mineral nitrogen |
| Author Name | Affiliation | | ZHANG Shaowu | College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling,Shaanxi 712100, China | | HU Tiantian | College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling,Shaanxi 712100, China | | CHEN Shaomin | College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling,Shaanxi 712100, China | | LI Hongxiang | College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling,Shaanxi 712100, China | | ZHANG Jie | College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling,Shaanxi 712100, China |
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| Abstract: |
| In order to reveal the effects of different technical parameters of drip irrigation and fertilization cycleon dynamic and distribution of nitrate nitrogen in the root zone and to seek the suitable technical parameters for young dwarf apple orchard in the Weibei Area, field drip fertilization experiment was carried out on the 4-year-old apple trees. The experiment included three factors: arrangement of drip lines (one pipe per row, P1; two pipes per row, P2), emitter spacing (30 cm, D1; 50 cm, D2) and fertilization cycle(15 days, T1; 30 days, T2). The dynamic change and distribution of nitrate nitrogen was monitored in root-zone soilduring the growth period. The test year was a normal water year, and the soil moisture content was relatively high. Under these conditions, the results showed that the content of nitrate nitrogen at T1 and T2 were 7.06~168.36 mg·kg-1and 9.73~248.86 mg·kg-1, respectively. Prolonging fertilization cycle increased the change range of nitrate nitrogen in 0~40 cm and 80~100 cm soil layers during the growth periodand aggravated the movement of that to the deep layer as well as reduced that in 0~60 cm soil layer(the main root layer). The diffuse area of nitrate nitrogen at P2 were larger than that at P1 in vertical direction of tree row, while the vertical depthwas opposite. Compared with D1, the distribution range of nitrate nitrogen in both vertical direction of tree row and vertical depth were larger when at D2. Along the tree row direction, the uniformity of nitrate nitrogen at D1 was more sufficient under P2. In summary, P2D1T1 increased distribution range and uniformity of nitrate nitrogen in root zone and contact area between nitrate nitrogen and root system and reduced nitrate leaching outside the root zone which was more suitable for the application of young apple orchard with dwarf and dense planting. |
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