In the dry steppe zone of the Tersko-Sulak sub-province of the Republic of Dagestan, a positive effect of drip irrigation against the background of heap tillage on the yield and quality of sweet pepper fruits was established. The effectiveness of maintaining the pre-irrigation threshold for soil moisture not less than 80 % of HB in the root-inhabited layer in combination with dump tillage to a depth of 0.23…0.25 m proved. This combination provides fruit yield at the level of 60…62 t/ha with an increase in sugar content and content Vitamin C compared to fine processing. The data obtained indicate the inappropriateness of the use of fine processing sweet pepper at 0.10…0.12 m under irrigated conditions, which leads to a deterioration in agrophysical and phytosanitary indicators of fertility. In particular, the soil density increases by 0.05…0.08 t/m3, the number of water-resistant aggregates decreases by 7 %, water permeability decreases by 22 % and the coefficient of water resistance increases by more than 2 times weed plantings and potential soil weed. Determined that out of the three studied constant pre-irrigation thresholds of humidity of the root layer (70, 80 and 90 % LMC), the best conditions for plant growth and development are formed at 80 % LMC: photosynthetic potential increases by 12 %, photosynthesis net productivity by 20.9 %, the efficiency of photosynthetically active radiation to 1.02 %, a decrease in the utilization rate of irrigation water by 28.3 % (70.3 m3/t). In order to maintaining a pre-irrigation moisture threshold of at least 80 % LMC, irrigations with a norm of 216 m3/ha carried out, after-planting irrigation of seedlings with an irrigation norm of 65 m3/ha with an average irrigation rate of 4384 m3/ha The combination of pre-irrigation threshold in a layer of 0.5 m 80 % LMC and dump processing provides a return on production costs of 173.1 % with a payback period of 1 year.
Relevance. In the conditions of the dry-steppe zone of lowland Dagestan, the beneficial effect of drip irrigation in combination with dump cultivation on the yield and quality of sweet pepper fruits from Moldova proved. Results. It experimentally established that maintaining moisture in the active 0.5 m soil layer during the growing season within 80- 100% of LMC against the background of dump processing to a depth of 0.23-0.25 m led to an increase in yield and biochemical composition of sweet pepper fruits. Differences in the influence of dump and small (0.10-0.12 m) tillage on agrophysical and phytosanitary indicators of fertility of meadow medium loamy soil were revealed. The data showing the inappropriateness of using small-scale cultivation under conditions of irrigated vegetable growing, which leads to a deterioration in the agrophysical indicators of fertility: increase in soil density by 0.05-0.08 t/m3, decrease in the number of water-resistant units by 7,0%, water permeability reduction by 22.0% and water resistance coefficient by 12.9%, 2.1 times increase in planting weed and 212.6% potential soil weed. Of the three studied thresholds of soil moisture (70, 80 and 90% LMC), it was established that the best conditions for plant growth and development, optimization of their photosynthetic activity are created at a humidity threshold of 80% LMC, at which the most efficient use of irrigation water is noted. Drip irrigation with maintaining the pre-irrigation threshold for soil moisture not lower than 80% of against the background of dump processing leads to an increase in the number of fruits on 1 plant, an increase in the mass of 1 fruit, which contributed to an increase in yield to 62 t/ha.
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