Summary |
Studies are dedicated to development and optimization
of cotton crop water-nutrient regime providing high, stable,
and qualitative raw-cotton crop yields under effective use
of water, nutrient and other resources, improvement of planning
and management of on-farm water use, development of scientifically
based recommendations on water-nutrient regime of cotton
crop and water use management improvement.Climate of north Tadjikistan is characterized by high
daily and seasonal fluctuations of temperature, intense
solar radiation, air dryness, and low cloudiness.Soil is gray brown, strongly stony. Irrigated area - 10 ha.Irrigation network is open in earthen channel, its
efficiency - 0.72-0.85EPP is equipped with measurement and account means.Studies found out that with increase of total water
consumption from 5.5 to 7.5 th.m3/ha raw-cotton
crop yield increases from 1.0 to 3.3 t/ha, and further water
consumption increase doesn't result in substantial crop
yield variation.
It is proved that in conditions of gray brown stony
soils of north Tadjikistan optimal irrigation regime for
medium fibre cotton crop is irrigation according to soil
humidity at least 75-80-60% of normal water capacity, and
fertilizers norms should be differentiated depending on
nutrients concentration in soil. It is also necessary to
establish 250-350 kg nitrogen, 100-350 kg phosphor, and
100-150 kg potassium per 1 ha. Such combination of irrigation
with fertilization provides 3.3-3.6 t/ha raw-cotton. |
Bibliography |
Author - Domullojanov Kh.D.Title - "Efficiency of irrigation combination
with fertilizing cotton crop in Tadjikistan"Review information, PTI, 1973.
This review generalizes experimental and production
regarding efficiency combination of irrigation with fertilizing
norms under cotton crop. |
