IMPACT OF DIFFERENT DOSES OF ORGANIC MANURES ON BELOW GROUND BIODIVERSITY IN SOYBEAN CROPPING SYSTEM
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Date
2009-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The investigation on the impact of organic manure and chemical fertilizers on the
abundance of soil arthropods, soil fertility and influence of abiotic factors on soil
arthropods in soybean cropping system was carried out at the Zonal Agriculture Research
Station, University of Agricultural Sciences, GKVK, Bangalore, during kharif 2008. Soil
application of 20 t of FYM/ha recorded significantly higher soil invertebrates as
compared to other treatments during the cropping season. Similarly, the soil total Acari,
other Acari, cryptostigmatids and other invertebrates were significantly higher in the
plots treated with the FYM or FYM + fertilizer as compared to the recommended
fertilizer alone during cropping season. Application of recommended FYM + mulching
(Glyricidia 2t/ha) recorded higher population of soil invertebrates compared to other
treatments during non-cropping season. There was a significant negative relationship
existed between the abundance of soil invertebrates and maximum temperature of the
atmosphere. Application of recommended fertilizer alone (25:60:25 kg NPK/ha) recorded
higher foliar insect abundance compared to other treatments. Application of FYM
enhanced the nutrient status of the soil. The plot treated with 20 t of FYM recorded
significantly higher organic carbon, available phosphorus, available potassium,
exchangeable calcium and exchangeable magnesium. Significantly higher available
nitrogen was obtained in package of practices followed plot. Significantly higher soil
macro-arthropods abundance was recorded in plot treated with recommended FYM
(partially decomposed) during cropping season. Soil application of 20 t of FYM recorded
higher grain yield (21.76q/ha) compared to chemical fertilizers alone (14.06 q/ha.) and
package of practices followed treatment (17.86 q/ha).
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