EFFECT OF DIFFERENT LEVELS OF ENRICHED PHOSPHATIC SLUDGE APPLICATION ON SOIL PROPERTIES, GROWTH, YIELD AND QUALITY OF MAIZE (Zea mays L.) AND PADDY (Oryza sativa L.) CROPS
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Date
2017-12-27
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Analysis of enriched phosphatic sludge (EPS) revealed that it contained 11.30 per
cent organic carbon, 6.88 per cent phosphorus and appreciable amount of other nutrients
and can be used as manure in crop production. Incubation studies revealed that rate of
release of major, secondary and micronutrients was higher in T7 (soil + EPS @ 1250 kg
ha-1) over control under flooded condition. Pot culture experiments revealed that
application of RDF + EPS @ 750 kg ha-1 significantly increased the plant height, dry
matter production and nutrient uptake by paddy at 60 DAT. The heavy metal content in
soil and plants were below detection limit. Further, field experiments revealed that kernel
and stover yield of maize increased with increasing levels of EPS as compared to control
and significantly higher kernel (90.84 q ha-1) and stover (110.80 q ha-1) yield and nutrient
uptake was recorded due to application of RDF + 750 kg EPS ha-1 and it was on par with
RDF + FYM @ 10 t ha-1. Grain (76.70 q ha-1) and straw (89.37 q ha-1) yield of paddy was
higher with the application of RDF + 750 kg EPS ha-1. Nutrient status of soil after harvest
of maize and paddy was improved in treatment which received RDF + 1000 kg EPS ha-1,
RDF +750 kg EPS ha-1 and RDF + FYM @ 10 t ha-1. Economic analysis revealed that,
highest B: C (2.50) was obtained in treatment T2 which received RDF + FYM 10 t ha-1 in
maize and highest B:C (2.46) was obtained in treatment T6 which received RDF + 750 kg
EPS ha-1 in case of paddy. The heavy metal elements content was below detection limit
both in rice and maize kernel and in soil.
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