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Home / Archive / 2019 - 2 (34) release Date 16.05.2019 . / THE IMPACT OF SEEDING RATE ON STRUCTURE AND YIELD VALUE OF RICE VARIETY FLAGMAN


Author: Dokuchayeva L.M. Balakay G.T. Yurkova R.Ye.


Topics: 06.01.02 Land Reclamation, Recultivation, and Land Protection


The aim of the research is to study the impact of seeding rates on structure and value of the rice variety Flagman yield under the conditions of Rostov region. The studies were conducted on a rice check in Manych-Agro LLC Bagaevsky District Rostov Region. The influence of the seeding rate on the development of rice variety Flagman, its crop structure and transpiration was studied according to the following scheme: 1) the seeding rate of 3 million units/ha (control); 2) 7 million units/ha; 3) 11 million units/ha. The rice yield was determined by the method of trial plots of B. A. Dospekhov, the yield structure was determined by the method of V. G. Wolf, and the intensity of transpiration according to L. I. Ivanov. By means of regression analysis, the connection of the yield structure elements with the yield of rice was determined. Research results showed that by the end of the growing season, rice thinning in the field test at a seeding rate of 3 million units/ha (option 1) was 42 %, at 7 million units/ha (option 2) – 53 %, with 11 million units/ha (option 3) – 54 %. The number of plants per 1 square meter was 173, 332 and 510, respectively. The leaf surface area on average in the phases of development was 5.3, 7.8, 8,1 square meters per square meter of cultivated area in variants 1, 2 and 3, respectively. The increase in leaf surface area up to 50 % compared with the control contributes to the formation of a larger rice yield, and its increase by more than 50 % provokes the underdevelopment of plants: their height, the number of productive panicles per 1 square meter, the mass of grain in the panicle and the mass of 1000 grains decrease, which leads to yield reduction. The correlation dependences of rice yield on the structure factors indicate a strong correlation and the need to develop measures reducing the development of the vegetative mass, and increasing the number of productive panicles and their grain content. Optimal thickening of crops not only contributes to the rice yield increase, but also reduces water consumption for the production of 1 centner of rice, which ranged from 4.49 mm (option 1) to 8.01 mm, and at best variant 4.41 mm.
Key words: yield structure elements, rice, seed rate, thickening, grain content, crop yield, variety.
DOI: 10.31774/2222-1816-2019-2-35-50

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