Soybean varieties are being studied in Uzbekistan, and cultivation technologies are being improved and new ones are being created. In this research, the effect of phosphorus fertilizers on soybean varieties was studied in the conditions of meadow-swamp soils of Tashkent region. The field experiments were carried out in 4 rows, the piles were 20 m long, 3.6 m wide, with 6 rows, of which 2 rows were marked in the middle and 4 rows were marked as protective rows at the edges. The results showed that when the norm of nitrogen and potassium-based phosphorus fertilizers was 80 kg, the leaf surface averaged 42.6 thousand m2/ha in the Nafis variety. In the second variant, when the phosphorus content was increased to 40 kg, the leaf surface was found to be 2,000 m2/ha higher. In the Vilana variety, the leaf surface area was 42.4 thousand m2/ha at low phosphorus levels, while the leaf surface was found to be 2.2 thousand m2/ha when the phosphorus level was increased by 40 kg.
This article presents the results of experiments conducted in the conditions of meadow-swamp soils of Tashkent region. The study of the effect of various norms of trace elements sulphur, manganese and iron on the growth, development and yield of early maturing varieties of soybeans was studied. Positive results were obtained from moderate levels of sulphur and manganese, and low levels of iron. Macro and micronutrients had a positive effect on soy yield. An additional 7.6 quintals (q)/ha was harvested in exchange for macro fertilizer. Compared to the background variant, the yield was 4.6-8.3 q/ha for sulphur and 4.9-9.8 q/ha for manganese. The yield of the iron element was lower than that of the background variant. Grain quality has changed in exchange for macro and micronutrients. In exchange for mineral fertilizers, this figure increased by 2.4%. In exchange for the element sulphur, the protein increased by 3.1-5.8%; an increase of 4.4-8.4% was observed in exchange for the element manganese. It was noted that the protein increased by 7.9-8.7% in exchange for the element iron.
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