An Asian Journal of Soil Science

K. R. Ashoka ¹, T. H. Hanumantharaju ², Atheefa Munawery ², Chakpram Birendrajit ², D. K. Sandeep Kumar ², M. Manjunath ³

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN
2 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN
3 Department of Sericulture, College of Agriculture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

A laboratory experiment was conducted to study the persistence and degradation of propineb in soils from Malur and Hassan (sandy clay loamy) at 25 and 50 μg g^-1 with field capacity and half-field capacity moisture regimes. The degradation pattern followed the first order kinetics. Degradation of propineb was faster under field capacity than half-field capacity moisture regimes at both rates in both the soils. Higher degradation was noticed in Malur soil than Hassan soil at both the rates of application and moisture regimes. The half-life values ranged from 6.5 to 7.1 days for Malur soil and 6.9 to 7.1 days for Hassan soil when applied at 25 and 50 μg g^-1 of propineb under field capacity. Under half-field capacity the half-life ranged from 7.1 to 7.9 days for Malur soil and 9.1 and 9.8 days when applied at 25 and 50 μg g^-1 of propineb, respectively.

Keywords

Persistence, Degradation, Propineb, Sandy Clay Loam.

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P. Veeranagappa ¹, H. C. Prakasha ¹, K. R. Ashoka ¹, M. M. Venkatesha ², M. B. Mahendra Kumar ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN
2 Department of Agronomist, C.C.R.I., Balehonnur (Karnataka), IN

Abstract

A field experiment was conducted on a Typic Haplustalf with sandy loam texture to study the effect of Zn-E compost on soil properties and distribution of zinc fractions in soil. The experiment was laid out in Randomized Complete Block Design with three replications. There were eight treatments comprising of recommended dose of compost, NPK fertilizers, ZnSO₄ and zinc enriched compost. Application of NPK + compost + ZnSO₄ at 20 kg ha^-1 and different levels of Zn-E compost treated plots recorded significantly higher values of primary, secondary and micronutrients in soil at tillering, panicle initiation and at harvest stages. A slight improvement in soil pH, electrical conductivity and organic carbon content noticed higher values in NPK + zinc enriched levels followed by package of practice. The application of Zn-E compost increased the amount of zinc present in different fractions. Increase in amount of zinc present in different zinc fractions might be due to the higher solubility and mobility of the added zinc source. Water soluble plus exchangeable fractions significantly increased with the enrichment of compost.

Keywords

Zn-E Compost, NPK, Zinc.

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K. R. Ashoka ¹, T. H. Hanumantharaju ¹, M. B. Mahendra Kumar ¹, Chakpram Birendrajit ¹, Atheefa Munawery ¹, P. Veeranagappa ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

A season study (December 2008 to march 2009) was undertaken with potato crop and was found that propineb residue degraded faster in potato under field condition when applied at 1400 and 2800 g a.i ha^-1. However, the propineb was noticed in soil on the day of propineb spray. Degradation was faster at lower dose of than higher dose of application with the half-life values of 2.3 and 2.5 days. The safe waiting period of 3.3 and 4.3 days was recommended for potato when applied at 1400 and 2800 g a.i ha^-1 of propineb.

Keywords

Propineb, Potato, Degradation, Bisdithiocarbamate.

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D. K. Sandeep Kumar ¹, T. H. Hanumantharaju ¹, K. G. Shilpa Shree ¹, K. R. Ashoka ¹, C. N. Nalina ¹, S. Sheela Rani ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

Persistence of pyrazosulfuron-ethyl was studied in three different soils (Shimoga, Mandya and Chamrajanagar) of Karnataka under three moisture regimes (maximum water holding capacity, half maximum water holding capacity and submergence). The persistence of pyrazosulfuron-ethyl indicated a close correspondence to first order exponential degradation kinetics in soils and mainly influenced by soil organic matter and moisture. Faster disappearance was noticed under submergence followed by maximum water holding capacity and half maximum water holding capacity in all soils. Persistence of pyrazosulfuron-ethyl was lower in Shimoga soil followed by Chamarajanagar and Mandya under all moisture regimes. Half lives for pyrazosulfuron-ethyl under half maximum water holding capacity, maximum water holding capacity and submergence ranged from 74.6 to 85.5, 57.7 to 62 and 42.9 to 53.8 days, respectively.

Keywords

Persistence, Degradation, Pyrazosulfuron-Ethyl, Maximum Water Holding Capacity, Submergence.

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