Grain Zinc Phytic Acid and Nutrient Uptake in Common Bean is Influenced by Sources and Concentrations of Zinc Fertilization

Abstract

Aim: To study the effect of different sources and levels of zinc fertilization on phytic acid content and nutrient uptake in common beans.
 Design: Randomized complete block design.
 Place and Duration of study: Division of soil science and agricultural chemistry, Faculty of Agriculture, Sheri Kashmir University of agricultural science and technology, Kashmir, between 2017-2018.
 Methodology: A field experiment was conducted to verify the response of common bean (Phaseolus vulgaris L.) to the different sources zinc fertilizer. Three different sources of Zinc Viz:- Zinc Sulphate, Zinc Gluconate and Zinc EDTA were used. Each fertilizer was used in three different amounts. Concentration of Zinc, overall zinc uptake, phytic acid, phytic acid Zinc molar ratio and overall nutrient uptake was estimated.
 Results: The data was analyzed using OPSTAT software at P= 0.05. The application of zinc had a positive impact on increase of zinc concentration from 36.6 to 58.2 mg kg-1 in common bean and overall zinc uptake from 0.43 to 1.02 kg ha-1. It was observed that with the increase in levels of zinc there was a decrease in the concentration of phytic acid from 11.92 to 7.8 mg g-1 hence, phytic acid: Zinc molar ratio also decreased from 31.2 to 13.2. There was a positive correlation between nutrient uptake and zinc concentration in beans.
 Conclusion: Application of Zinc significantly increased the overall nutrient uptake of plants except phosphorus. Among all the sources, Zinc EDTA proved to be most efficient fertilizer followed by zinc Gluconate for enhancing the concentration of zinc and decreasing the concentration of anti- nutritional factor (phytic acid) in beans. Therefore zinc fertilization can be used as an effective method to improve zinc concentration in beans and hence combat zinc deficiency.

Combining Zinc Biofortification and Native Trichoderma Inoculation Strategies for Subterranean Clover

“…The treatments generally increased Fe and Zn accumulation but decreased the Mg and P levels in the treated plants compared to the negative control without Zn (T0 + no Zn). The general decrease in P uptake may be explained by the inhibitory effect of Zn on the root uptake and shoot accumulation of P, leading to a decrease in P uptake with increased Zn fertilization [55]. Meanwhile, studies have shown that increased Zn application can indeed lead to a decrease in Mg uptake by plants [56].…”

Biofortificação de feijão com zinco: efeitos de fontes, formas de aplicação, doses, e do fungo Pochonia chlamydosporia

“…A queda nas variáveis que medem a produtividade pode estar relacionada, com a ocorrência de fitotoxidez, pois foram verificadas lesões nas folhas e vagens a partir da dose de 5 mg dm -3 de Zn (10 kg ha -1 ) com ZnSO4 e Zn-Amino (Figura 3), observando-se, também, impedimento do desenvolvimento das vagens em formação no ápice das plantas. (Naik e Das, 2008;Zhao et al, 2015;Zhao et al, 2019;Baligah et al, 2020).…”

“…O excesso de Zn nas plantas pode induzir estresse oxidativo, causar alterações na estrutura foliar, redução na transpiração, na condutância estomática, no conteúdo de clorofila e carotenóides e, consequentemente, redução na fotossíntese(Shi e Cai, 2009;.As doses de Zn das fontes ZnSO4, Zn-EDTA e Zn-Amino, apresentaram respostas diferentes, quanto ao aumento dos teores de P, K, Ca, Mg e S, nos grãos de feijão (Figura 4), com destaque para o Zn-EDTA e Zn-Amino, que aumentaram os teores desses nutrientes nos grãos. Tem sido relatado que a aplicação de doses de Zn-EDTA aumentou os teores de K em folhas de feijoeiro e em grãos de trigo(Baligah et al, 2020; Luís et al, 2019) e também, a aplicação de glicina aumentou os teores de P e S em plantas de alface(Khan et al, 2019). Vale ressaltar, que a glicina aplicada na alface é o mesmo aminoácido presente no Zn-Amino e, possivelmente, esse aminoácido pode ter contribuído para o aumento do P e S, nos grãos de feijão.…”