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

RICE EVAPOTRANSPIRATION IN EXPERIMENTAL PLOTS SPECIFIC TO RICE GROWING IN ROSTOV REGION

Topics: 06.01.02 Land Reclamation, Recultivation, and Land Protection

Abstract:

The purpose of the research is to study the characteristics of rice evapotranspiration in the experimental plots typical to the rice-growing zone of Rostov region. The studies were conducted in two areas – the scientific testing site of the Federal state budget scientific establishment «The Russian scientific research institute of land improvement problems» (lysimetric method) and rice crops in paddy fields at the Manych-Agro Limited Liability Company of the Nizhnyy-Manych irrigation system (Bagaevskiy district of Rostov region). The plots are identical in climatic conditions. It was concluded that the experimental data obtained in the lysimeter vessels are consistent with the common patterns of evaporation and transpiration values change in other regions. Evaporation in the initial period of rice growth significantly exceeds transpiration in the same period. So, during the period of emergence – tillering, the transpiration and evaporation ratio were only 29 %, 71 %, correspondingly. But since the earing stage, a decrease in water consumption for evaporation is observed. Its ratio in ET varies in different phases from 40 to 22 %. In an experiment paddy field in Manych-Agro LLC, the weight of the leaf blade of a single plant which is necessary for calculating rice transpiration in all variants with a seeding rate of 3, 7, 11 mln units/ha increases from tillering stage to wax ripeness. The largest increase was observed in the variant with a seeding rate of 3 million units/ha (from 4.7 to 5.1 g). It is shown that on average for the entire period of rice formation and ripening, the plant’s leaf area duration in the variant with a seeding rate of 3 million units/ha was 5.4 square meters per 1 square meter of sowing, and in variants with 7 and 11 million units/ha, respectively, 46 and 50 % more, which affects the transpiration of rice crops. Transpiration at a normal seeding rate of 3 million units/ha for the entire period amounted to 385.2 mm, or 3852 cubic meters per hectare which is less by 12 % compared with data on transpiration at the scientific testing site. Experimental data showed that, when calculating the rice water demand for the conditions of Rostov region, evapotranspiration is within 800 mm, 55 % of which is goes to transpiration.
Keywords: evapotranspiration, evaporation, transpiration, growth stage, leaf area duration, water demand, rice.
DOI: 10.31774/2222-1816-2018-4-184-200

For citas:
G. T. Balakay, L. M. Dokuchaeva, R. E. Yurkova. EVAPOTRANSPIRATION IN EXPERIMENTAL PLOTS SPECIFIC TO RICE GROWING IN ROSTOV REGION. Scientific Journal of Russian Scientific Research Institute of Land Improvement Problems. 2018. No 4. P. 184-200  DOI:https://doi.org/10.31774/2222-1816-2018-4-184-200

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