Long-term Effects of Potassium Nutrition on Productivity and Sustainability of a Sorghum-Wheat Cropping System


Control	NPK 120:60:60 kg/ha
A bumper crop with balanced fertilization

Materials and methods:

Started on 1985-86 at the PRII, Gurgaon (Haryana)
Rotation: SORGHUM (fodder) in kharif and WHEAT in rabi
Soil: Udic Ustochrept, loamy sand

9 Treatments:

Control (without any NPK application)
3 levels of POTASSIUM: 0, 60 (optimal) and 120 kg/ha (high)
2 levels of NITROGEN: 120 (optimal) and 240 kg/ha (high)
2 levels of PHOSPHORUS: 60 (optimal) and 120 kg/ha (high)
Optimal NPK and FYM application

3 repetitions/treatment

Treatment	N (kg N/ha)	P (kg P₂O₅/ha)	K (kg K₂O/ha)	FYM (ton/ha)
1	0	0	0	0
2	120	60	0	0
3	120	60	60	0
4	120	60	120	0
5	240	120	0	0
6	240	120	120	0
7	120	60	60	10
8	120	60	30 + 30	0
9	240	120	60 + 60	0

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