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Nitrogen management for wheat (Triticum aestivum L.) intercropped with variable aged poplar (Populus deltoides Bartr.) plantations in North-Western India
Journal of Plant Nutrition ( IF 2.1 ) Pub Date : 2021-07-09 , DOI: 10.1080/01904167.2021.1949463
Janpriya Kaur 1 , Baljit Singh 2
Affiliation  

Abstract

Agroforestry system (AFS) is considered to be sustainable agricultural practice delivering wide range of ecosystem services. Nutrients and light are principal limiting resources for understorey crops. To optimize productivity, recommendation is to use well adapted tree–crop–fertilizer combinations. Nitrogen (N) management for wheat poplar is essential for maximizing synergies but the data is scarce. Therefore, current study addressed the issue by monitoring wheat performance fertilized with N: control (N1), 60 (N2), 90 (N3), 120 (N4), 150 (N5), 180 (N6) and leaf color chart (LCC) based-115 (N7) kg ha−1 under 2-, 3-, 5- and 6-year poplar. Tree age and N levels were key determinants of yield with reduction in growth (number of tillers m−1, plant height, ear length), yield parameters (1000-grain weight, number of grains ear−1), yield and NUE of wheat with advancing tree age, maximum reduction under 6-year plantation. However, fertilization with N7 −115 kg N ha−1 showed highest increase in grain yield (95.1%), harvest index (20.1%), NUE (agronomic efficiency (AE) 53.5% and recovery efficiency (RE)-91.1%). Nutrient uptake by grains showed maximum decrease of 32.1 (N), 13.6 (P) and 22.8 (K)%, respectively under 6-year-poplar. Averaged over poplar age, the N fertilizer treatment N7 lead to maximum increase of 2.3-, 2.9- and 2.3-folds in N, P, K uptake by grains, respectively. Therefore, the N management of wheat with N7 −115 kg N ha−1 (LCC-based treatment) under poplar tree canopies show the potential to mitigate the risk of poor crop yield and contribute to food security.



中文翻译:

印度西北部小麦 (Triticum aestivum L.) 与变龄杨树 (Populus deltoides Bartr.) 人工林间作的氮管理

摘要

农林业系统 (AFS) 被认为是提供广泛生态系统服务的可持续农业实践。养分和光照是林下作物的主要限制资源。为了优化生产力,建议使用适应性强的树木-作物-肥料组合。小麦杨树的氮 (N) 管理对于最大化协同作用至关重要,但数据很少。因此,当前的研究通过监测施氮小麦的性能来解决这个问题:对照 (N1)、60 (N2)、90 (N3)、120 (N4)、150 (N5)、180 (N6) 和叶色图 (LCC) ) 基于 115 (N7) kg ha -1在 2 年、3 年、5 年和 6 年的杨树下。随着生长的减少(分蘖数 m -1, 株高, 穗长), 产量参数 (1000 粒重, 穗粒数-1 ), 小麦的产量和 NUE 随着树龄的增加, 6 年种植的最大减少。然而,施用 N 7 -115 kg N ha -1 的施肥显示出谷物产量 (95.1%)、收获指数 (20.1%)、NUE(农艺效率 (AE) 53.5% 和恢复效率 (RE)-91.1%)的最高增幅。 . 在 6 年生杨树下,谷物对养分吸收的最大降幅分别为 32.1 (N)、13.6 (P) 和 22.8 (K)%。平均在杨树龄期,施氮肥处理 N 7 分别导致谷物对 N、P、K 吸收的最大增加 2.3-、2.9- 和 2.3-倍。因此,N 7 -115 kg N ha的小麦施氮管理-1(基于 LCC 的处理)在杨树树冠下显示出降低作物产量低风险和促进粮食安全的潜力。

更新日期:2021-07-09
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