Effect of sources and levels of potassium in cotton as influenced fractions of soil potassium under vertisols in Vidarbha region of Maharashtra

Y. B. KADAM, V. K. KHARCHE, V. S. BORKAR, N. M. KONDE, V. V. GABHNE

Abstract


The present investigation was carried out in vertisols of Akola district of Maharashtra to
ascertain the effect of potassium application on yield and quality of Bt cotton. This was
carried out by conducting field experiments on research farm of Department of Soil Science
and Agricultural Chemistry, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola and similarly
on five farmer’s fields in intensive cotton growing area of vertisols in Akola district during
2012-13 and 2013-14. The treatments comprised of various levels of potassium (0, 25, 50 kg
K2O ha-1) applied through either MOP or SOP and additional foliar sprays of SOP @1.5 per
cent at critical growth stages of cotton alongwith addition of equivalent quantity of sulphur
through bensulf and control without potassium. The fractions of soil potassium were found
to be increased alongwith increasing levels of potassium. The reduction in fractions of soil
potassium during peak growth stages suggests that there was highest uptake of potassium
during this stage and supplemental foliar application of potassium (SOP) had significant
response at critical growth stages. The vertisols of present investigation categorized as low
to medium in sulphur. Application of sulphur @ 18 kg ha-1 through bensulf was also found
equally beneficial as that of SOP for increasing yield. From the present investigation it can be
concluded that the fractions of potassium in soil decreased at critical growth stages of cotton
viz., flowering and boll development due to increasing uptake by cotton. The application of
potassium @ 50 kg K2O ha-1 either through MOP or SOP irrespective of sources showed
increase in soil potassium fractions and improvement in soil fertility.


Keywords


Fractions of soil potassium,Nutrient mining, Soil fertility

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