Comparative rice yield and economic advantage of foliar KNO3 over soil applied K2SO4
2012
Khan, A.W. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Sciences Inst.) | Mann, R.A. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Sciences Inst.) | Saleem, M. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Sciences Inst.) | Majeed, A.
A field experiment was conducted at Kala Shah Kaku to study the effect of foliar application of potassium nitrate (KNO3) in comparison to soil incorporated potassium sulphate (K2SO4) on the growth and yield of fine rice "Super Basmati". The treatments were control, i.e. soil application of K2SO4 @ 70 Kg per ha (T1), foliar application of KNO3 @ 0.5% solution (T2), foliar application of KNO3 @1% solution (T3), foliar application of KNO3 @ 1.5% solution (T4) and foliar application of KNO3 @ 2% solution (T5). Foliar KNO3 application @ 1.5% and 2% solutions increased paddy yield by 5.74% (4.97 t per ha) and 10.85% (5.27 t per ha) against that of soil incorporated K2SO4 (4.7 t per ha). Significant increase in number of tillers (m-2), thousand grain weight, biological and paddy yield was recorded with foliar KNO3 @ 1.5% and 2% over soil applied K2SO4; however, non-significant differences were found on plant height, panicle length, and grains per panicle. Foliar KNO3 @ 1.5% and 2% solutions resulted in net returns of Rs.14,828 and Rs.23,804 per ha, respectively.
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