| Effect of nitrogen fertilizer amount on root growth and yield of spring soybean in drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2018.04.07 |
| Key Words: soybean nitrogen rate root system growth drip irrigation yield |
| Author Name | Affiliation | | GAO Yang | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CHU Guang-hong | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | FU Ji-hai | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Yan-wei | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Jian-xin | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In order to investigate the effect of nitrogen application amount on root growth and yield of spring soybean with high yield in drip irrigation, the excavation sampling method was used to study the effects of four nitrogen fertilizer amount treatments, which are 0 kg·hm-2(N0), 75 kg·hm-2(N75), 150 kg·hm-2(N150) and 225 kg·hm-2(N225) on soil root dry weight, root length and root surface area, activity and bleeding rate, nodule number, quality of 0~80 cm soil layer and yield of New Soybean No. 27. the total root dry weight, total lateral root length, and total lateral surface area of lateral roots, and the treatment was highest at N150 and was at R5 (initial grain size).The results showed that the total dry weight, the length of lateral root and the surface area of lateral roots in 0~80 cm soil layer showed a trend of increasing at first and then decreasing with the increase of nitrogen application amount. and all of them was highest at N150 treatment, compared with N0 treatment, the total dry weight, the length of lateral root and the surface area of lateral roots in 0~80 cm soil layer at R5 period increased by 27.3%,49.46% and 38.14%, respectively. while its in 0~80 cm soil layer at increased by 27.0%,29.02% and 34.24%. The wound flow of each plant at R5 increased by 176.0%. The root activity of N150 treatment in 0~20 cm and 20~40 cm soil layers at R2 increased by 44.3% and 25.1%, respectively, The number and quality of root nodule at R5 stage in N150 treatment decreased by 8.74% and 34.6%,The yield of N150 treatment was higher, which was 4 898.62 kg·hm-2, and the utilization efficiency of nitrogen fertilizer was 3.58 kg·kg-1. Nitrogen application can increase spring soybean is mainly to promote the root growth of 0~20 cm soil layer and increase the root activity of 0~40 cm. |
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