Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 21 ISSUE 3
Written by Reta DRĂGHICI, Iulian DRĂGHICI, Milica DIMA, Mihaela CROITORU, Alina PARASCHIV, Maria BĂJENARU, Gheorghe MATEI, Georgeta CIURESCU

The researches were carried out in the period 2020-2021 on the cowpea crop, located in irrigated conditions, on a sandy soil with low natural fertility, in the southern area of Oltenia, and aimed at reducing the effects of abiotic stress and increasing production, through management fertilizing the crop with environmentally friendly products. Five variants of foliar fertilization were experimented (non-fertilized foliar, Basfoliar 36 Extra, in a dose of 3 l / ha; Maturevo 3.35.35 + ME, in a dose of 3 kg/ha; liquid Biohumussol in a concentration of 1 %; Polyactiv Mn, at a dose of 1.5 l/ha), on two agrofunds of root fertilization (N30P30K30; N60P60K60). The obtained results showed that ensuring a rational fertilization of cowpea, in relation to the requirements of the plant and the state of soil fertility can regulate the mechanisms of plant protection against stressors on sandy soils. The foliar fertilization with environmentally friendly products has positively influenced the percentage of dry matter, bound water and the concentration of vacuolar juice in cowpea leaves, increasing the plant's resistance to thermohydric stress. Through the foliar fertilization of the cowpea crop, there were increases of production between 30-47.5%, on the agrofound of N30P30K30 and of 15.8-22.1% on the agrofund of N60P60K60. The cowpea registered a maximum production (2,983.4 kg/ha), at the fertilization with Maturevo 3.35.35 + ME, in a dose of 3 kg/ha, on the agrofund of N60P60K60, with the significant difference (p>0.05), compared to unfertilized foliar. There was a positive correlation, distinctly significant, between between the leaf area index and cowpea grain production (r = 0.882 **).

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