Online ISSN: 2515-8260

Keywords : verticillium wilt

Green Manure Crops Effects On Cotton Growth, Development And Productivity At Different Terms

Kenjaev yunus; jabbarov zafarjon; makhammadiev samad; makhkamova dilafruz; Turdibaev damir; Oripov razzak

European Journal of Molecular & Clinical Medicine, 2021, Volume 8, Issue 2, Pages 235-246

If in the control-green manure without crop experiment variants, the plant height was
80.6-79.1 cm, the yield horn was 14.2-14.1 pieces, the average joint spacing of the main
stem was 4.1-4.3 cm, the main stem thickness was 1.78-1.76 cm, when green manure crops
were applied, the agronomic soil properties and characteristics were positive for the plant,
coordinated the cotton growth and development, the plants were found to be relatively
vigorous and healthy growing and developing. This pattern was repeated in all
experimental years, and the data were observed in an analogous manner.
When green manure crops were applied in summer and autumn, the cotton
verticillium wilt incidence was reduced. This condition was observed throughout the
growth period. This, barley acted like rapeseed. For example, in the summer control-green
manure cropless variant, 4.9% of cotton plants were infected with verticillium wilt on July
15, 9.3% on August 1, and 13.3% on August 15, pea variant 4.5; 8.1; 12.4%, 3.8; 7.2;
11.8% in the chick-pea variant, respectively, raps variant 2.4; 5.1; 8.3%, barley variant was
2.7; 5.3; 8.9%.
In particular, in the fall, the control-green manure without crop variant was 5.8%
on July 15, 10.2% on August 1, and 14.8% on August 15, while the pea variant was 5.28.9;
13.1%, respectively; chick-pea variant was 4.8; 8.6; 12.1%, raps variant was 2.6; 5.3; 8.6%,
and 3.0; 5.8; 9.3% in the barley variant.
In the control-green manure cropless experiment variant, the yield was 35.1s/ha,
while in the green manure management variant 5.5-8.6 s/ha was obtained. In the
experiment, the highest yield (43.7 s/ha) and the most reliable additional yield (8.6 s/ha)
were obtained in the raps planted variant as a green manure crop, 42.8; 40.8 and 40.6 s/ha
yields were observed in barley, chick-pea and pea variants planted as green manure crops,


DSc. Kurbonov A.Y .; prof.Avtonomov V.A .; prof. Axunov A.A .; DSc.HashimovaN .

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 2, Pages 1044-1051

In the world's cotton-growing countries, cotton is cultivated on the territory of 89 countries, on a total area of more than 30 million hectares, from which more than 22.4 million tons of cotton fiber are obtained. Today, there are problems in the production of high-quality cotton fiber yield. One of these problems is pathogens that cause significant damage to cotton production, with losses in the world amounting to 12-15%. In the world, considerable attention is paid to the study and control of the pathogen Verticillium dahliae Klebahn, which affects cotton.
The problem of breeding wilt-resistant varieties of cotton is complicated by the search for new methods and donors of resistance to the pathogen. It is necessary to improve the method of selection of parent pairs during hybridization and qualitative assessment of interspecific hybrids at the early stages of the breeding process in order to increase the efficiency of breeding, speed up the process of introducing new varieties of cotton into production.The selection must be carried out on the basis of physiology and biochemistry of signs of resistance of the initial breeding material. The initial stage of selection should be based on test signs of resistance, which are associated with the catalytic activity of some enzymes involved in the formation of phytoimmunity against fungal infections (peroxidase, phenylalanine ammonialyase, polyphenol oxidase).The greatest interest of researchers is attracted by protective mechanisms, including the processes of lignification of cell walls and the biosynthesis of phenolic phytoalexins. These mechanisms simultaneously create a mechanical and chemical barrier to the penetration of fungal structures into the cell, preventing the spread of the pathogen.