The results of 3-year studies on the influence of water and nutrient regimes of the soil on the formation of the root system of aerobic rice cultivated with a drip irrigation system are presented. It was shown that, when maintaining the water regime of the soil at not lower than 80% HB in the 0.6-m layer, the root mass is 4.96 in the 0.4-m layer and 5.64 t/ha in the 0.6-m layer. In variant two, where soil moisture was maintained at 80% HB until the end of the tillering phase in the 0.4-m layer and from the booting phase to grain ripening in the 0.6-m layer, the plants were characterized by maximum foliage and habitus, which contributed to an increase in their root mass in the 0.4-m layer to 5.40 t/ha and to 6.14 t/ha in the 0.6-m layer. In variant three, where the water regime of the soil was maintained at 80% HB in the 0.4-m layer from sowing to the end of the tillering phase, then in the 0.6-m layer, and from wax to full ripeness of grain at 70% HB, the root mass was less than in variant two by 0.18 t/ha in the 0.4-m layer and by 0.20 t/ha in the 0.6-m layer but greater than in variant one (80% HB during the entire life cycle) by 0.26 in the 0.4-m layer and by 0.30 t/ha in the 0.6-m layer. Fertilizer doses also had a great effect on the root system of plants. Thus, the root mass was minimal (5.46 t/g) when N95P62K75 (5 t/ha) was introduced, while it increased in the N114P74K90 variant (6 t/ha) by 0.48 t/ha compared to the value at a dose of N95P62K75 (5 t/ha) and was less than when introducing N137P90K108 (7 t/ha) by 0.60 t/ha. The maximum grain yield (6.95 t/ha) was obtained at the soil water regime of 80% HB in the 0.4-m and 0.6-m layers when introducing N137P90K108 (7 t/ha), and the minimal grain yield (4.88 t/ha) was obtained at the soil water regime of 80% HB in the 0.6-m layer when introducing N95P62K75 (5 t/ha).
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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.
Translated by K. Lazarev
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Kruzhilin, I.P., Doubenok, N.N., Ganiev, M.A. et al. The Impact of Anthropogenically-Controlled Factors on the Formation of Root Mass and Rice Yield under Drip Irrigation in the Lower Volga Region. Russ. Agricult. Sci. 45, 561–564 (2019). https://doi.org/10.3103/S1068367419060120
- aerobic rice
- drip irrigation
- water regime
- fertilizer doses
- root system