• ISSN 1008-505X
  • CN 11-3996/S
ZHANG Jing-jing, BAI You-lu, YANG Li-ping, LU Yan-li, WANG Lei, LI Ge, ZHANG Yin-jie. Mechanism of spraying γ-poly glutamic acid increasing yield and nutrient uptake of summer maize[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(11): 1856-1867. DOI: 10.11674/zwyf.19073
Citation: ZHANG Jing-jing, BAI You-lu, YANG Li-ping, LU Yan-li, WANG Lei, LI Ge, ZHANG Yin-jie. Mechanism of spraying γ-poly glutamic acid increasing yield and nutrient uptake of summer maize[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(11): 1856-1867. DOI: 10.11674/zwyf.19073

Mechanism of spraying γ-poly glutamic acid increasing yield and nutrient uptake of summer maize

  • Objectives The experiment was conducted to study the regulatory effects of γ-poly glutamic acid (γ-PGA) on the growth and nutrients uptake of summer maize to provide technical guidance and theoretical basis for scientific use of γ-PGA in summer maize.
    Methods The treatment factors included two nitrogen levels normal nitrogen (N 180 kg/hm2) and 30% nitrogen reduction (N 126 kg/hm2), two synergists (γ-PGA and glutamic acid), and three dosage levels, low (37.5 g/hm2) and high (150 g/hm2) and clear water control (0 g/hm2). Measurements included summer maize dry matter accumulation, dynamic change of NPK, and yield traits.
    Results 1) There were significant differences between different synergists in the grain number per ear, yield, dry matter, and nutrient accumulation of summer maize. With spraying both low and high dose γ-PGA treatments, compared with clear water controls, higher yields were achieved by increasing the grain number per ear, and significantly promoting the accumulation of dry matter especially from flare opening stage to silking stage. The accumulation of N, P, K also increased significantly. There was no significant difference between two doses. The treatments with glutamic acid had no significant effects when compared with water control. 2) Under normal nitrogen level, compared with clear water control, the treatment with low-dose γ-PGA increased the total dry matter accumulation by 5.08% but had no significant effect on yield, while the high-dose treatment increased the yield by 3.42% with greater grain number but no significantly greater amount of dry matter accumulation. Both low and high dose treatments increased N, P, K accumulation by 5.20%–6.97%, 7.29%–10.85%, 3.48%–5.27%, respectively. At the 30% reduction of nitrogen level, the treatment with the high-dose γ-PGA increased the yield by 3.07% with greater grain number, while the low-dose treatment increased grain number per ear, grain weight and yield. For both treatments, the total accumulation of dry matter and potassium were increased by 6.48%–7.93% and 4.36%–6.12%. The low-dose treatment increased the accumulation of nitrogen and phosphorus by 8.41% and 11.94%, which were also significantly higher than those of high-dose treatment. There was no significant difference in all indexes of glutamate treatments under the two nitrogen levels. 3) In the high-yielding year (2017), the high-dose treatment with γ-PGA increased the yield by 2.54%, while the low-dose treatment had no significant effect on the yield. In terms of the total accumulation of dry matter and nitrogen, phosphorus and potassium, the increase was all significant. In the low yield year (2018), the yield of the low and high dose γ-PGA treatments was increased by 4.37% and 4.14%, respectively; and the accumulation of dry matter and nutrients of low dose treatment were significantly higher than those of control and the high dose treatment. For the glutamic acid treatment, only the low-dose treatment in 2018 significantly increased the yield by increasing the grain weight, but the effect was lower than that of γ-PGA.
    Conclusions The application of γ-PGA can promote dry matter accumulation after flowering and increase the total weight of dry matter and nutrient accumulation, and increase the yield mainly by increasing the grain number per ear of summer maize, while the application of glutamic acid has no significant effect. The major effects are not because of the decomposition of L-glutamic acid. Under 30% reduction of nitrogen, γ-PGA has a greater effect than that under normal nitrogen level. Under normal nitrogen level, the treatment with high dose γ-PGA has a better effect; while under 30% reduction nitrogen, the low dose treatment has a better effect. In addition, under 30% reduction of nitrogen, spraying low dose γ-PGA can achieve the goal of increasing efficiency while reducing fertilizer rate.
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