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Low irrigation water minimizes the nitrate nitrogen losses without compromising the soil fertility, enzymatic activities and maize growth

文献类型： 外文期刊

作者： Muhammad, Ihsan 1 ; Lv, Ju Zhi 2 ; Yang, Li 1 ; Ahmad, Shakeel 1 ; Farooq, Saqib 1 ; Zeeshan, Muhammad 1 ; Zhou, Xun Bo 1 ;

作者机构： 1.Guangxi Univ, Guangxi Coll & Univ Key Lab Crop Cultivat & Tilla, Agr Coll, Nanning 530004, Peoples R China

2.Guangxi Acad Agr Sci, Maize Res Inst, Nanning 530007, Peoples R China

关键词： Nitrogen leaching; Irrigation water; N fertilizer; Biochemical processes; Enzyme; Maize growth

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.26； 五年影响因子：5.761 ）

ISSN： 1471-2229

年卷期： 2022 年 22 卷 1 期

页码：

收录情况： SCI

摘要： Nitrate nitrogen (NO3-_N) leaching increased with nitrogen (N) fertilization under high water supply to the field negatively affected the maize growth and performance. This study aimed to understand the mechanisms of NO3-_N leaching on a biochemical basis and its relationship with plant performance with 5 different doses (0, 200, 250, 300, 350 kg N ha(- 1)) of N fertilizers under low (60%; LW) and high (80%; HW) water holding capacity. Soil and plant enzymes were observed at different growth stages (V9, R1, R3, and R6) of the maize, whereas the leachates were collected at 10-days intervals from the sowing date. The LW had 10.15% lower NO3-_N leachate than HW, with correspondence increases in grain yield (25.57%), shoot (17.57%) and root (28.67%) dry matter. Irrespective of the irrigation water, RubisCo, glutamine synthase (GS), nitrate reductase (NR), nitrite reductase (NiR), and glutamate synthase (GOGAT) activities increased with increasing N fertilizer up to the V9 growth stage and decreased with approaching the maturity stage (R6) in maize. In HW irrigation, soil total N, GOGAT, soil nitrate (NO3-_N), leached nitrate (LNO3-_N), root N (RN), leaf N (LN) were positively correlated with N factors suggesting the higher losses of N through leaching (11.3%) compared to LW irrigation. However, the malondialdehyde (MDA), hydrogen peroxide (H2O2), superoxide (O-2(-)), and proline were negatively correlated with the other enzymatic activities both under LW and HW irrigation. Thus, minimizing the NO3-_N leaching is possibly correlated with the LW and N300 combination without compromising the yield benefit and improving enzyme activities.

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