Abstract
Biostimulants are products that increase plant growth, resistance to water and abiotic stresses. it compositions, such as humic acids, amino acids, Ascorbic acids and other compounds. These substances cause changes in fundamental and structural processes to influence plant growth through enhanced tolerance to abiotic stresses and increase grain yield. The objectives of the present study were to investigate the effect of the foliar application of amino, humic and ascorbic acids with mineral fertilizers on growth, yield and chemical composition of wheat. The filed investigation was carried out at Baloza Research Station of the Desert Research Center, North Sinai, Egypt during the two successive seasons of 2019/2020. The experiment was conducted in a split plot design, with three replicates. The results obtained the yield components, total antioxidants, total phenol and nutrients concentration of wheat were increased with increasing the organic acids and antioxidants rates. The beneficial effect of treatments was arranged descending by as follows; ascorbic acid (antioxidants) > amino acids > humic acid > control. The most effective treatment was Am2 AS2 with hum2 (ascorbic acid at 600 ppm) with amino and humic acids (at 600 ppm), which achieved 3.4 ton/fed grains of wheat. The foliar application of antioxidants recorded higher increases of yield parameters and nutrients content in straw and grains of wheat than amino acids and humic acid, while the humic acid showed the lowest effect.
Highlights
The irrigation water source for wheat in the North-Sinai was the Salam canal water
The humic acid increased morphological criteria, metabolism, mineral contents (N, P, K, Ca and Mg) and yield of plants, Under salt stress, the foliar application of humic substances improved the uptake of nutrients by corn plant, the previous facts according to the studies [1,2,3], respectively
The objective of this study was to evaluate the effect of the foliar application of amino, humic and ascorbic acids at two rates (400 and 600 mg kg-1) was applied as foliar spray in two sprays and NPK and micronutrients at one rate was added to all studied treatments
Summary
The irrigation water source for wheat in the North-Sinai was the Salam canal water. The water in El Salam canal was slight salinity as 1500 ppm. The water irrigation was sufficient to complete wheat plant growth and production. Humic molecules increased leaf water retention and the photosynthetic and antioxidant metabolism under water stress. The humic acid increased morphological criteria (plant height, leaves number, fresh and dry weights of shoots), metabolism (photosynthetic pigment, total soluble sugar, total carbohydrates, total amino acids and proline), mineral contents (N, P, K, Ca and Mg) and yield (grain, straw and biology) of plants, Under salt stress, the foliar application of humic substances improved the uptake of nutrients by corn plant, the previous facts according to the studies [1,2,3], respectively
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