International Journal of Ecology and Environmental Sciences

International Journal of Ecology and Environmental Sciences


International Journal of Ecology and Environmental Sciences
International Journal of Ecology and Environmental Sciences
2020, Vol. 2, Issue 2
Optimization of nitrogen and potassium Fertigation schedules on nutrients uptake of sunflower

K Preethika Reddy, M Uma Devi, V Ramulu, M Madhavi

A field experiment was conducted at Water Technology Centre, College farm, Rajendranagar, Hyderabad during rabi 2017-18 with sunflower (var. DRSH-1). The experiment was conducted in a randomized block design with three replications in a sandy clay loam soil, alkaline in reaction, non saline, low in available nitrogen, medium in available phosphorus and potassium. The treatments were nine with combinations of N (75 kg ha-1) and K (30 kg ha-1) fertilizers applied by fertigation through ventury at different intervals viz., 3 days and 4 days. Drip irrigation was scheduled once in 2 days at 0.8 Epan. Fertigation was imposed at 16 DAS to 88 DAS and completed in 19 and 10 splits in 4 and 8 days interval respectively. The source of N and K fertilizers was urea and potassium sulphate respectively. At harvest, the total N content ranged from 0.59 to 0.89 % and 1.37 % to 1.84 % in sunflower stalk and shoots respectively. The total P content ranged from 0.12 to 0.21, 0.24 to 0.32% in sunflower stalk and shoots respectively. The total K content ranged from 0.91 to 1.46, 0.58 to 0.87% in sunflower stalk and shoots respectively. At harvest, the highest total uptake of N (281.6 kg N ha-1), P (55.5 kg P ha-1) and K (252.6 kg K ha-1) was noticed in T7 (75-30 kg N and K2O ha-1 at 4 days interval). Significant correlations were noticed between uptake of N, P and K with sunflower seed yield.
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