National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment was conducted at Regional Agricultural Research Station, Anakapalle in plant – ratoon sequence with different levels of phosphorus and uniform recommended dose of nitrogen and potassium under high P clay loam soils of North Coastal Andhra Pradesh during 2014-2015 and 2015-2016. The aim of this present study is to reduce/optimize the phosphorus fertilizer doses under high P soils. Results revealed that, significantly highest cane yields of 76.90 and 67.90 tha-1 was recorded with 70 kg P2O5 ha-1 in plant and ratoon crops, respectively and it was on par with 50 kg P2O5 ha-1 (76.47 and 64.47 tha-1, respectively). Significant sugar yield response was observed to increasing levels of P upto 50 kg P2O5 ha-1and highest sugar yields of 11.0 tha-1 and 8.80 tha-1 were recorded with 50 kg P2O5 ha-1 in plant-ratoon sequence. Experimental results clearly indicating the role of P in juice quality enhancement as juice quality was increased with increasing levels of P from 0 to 50 kg P2O5 ha-1, later there was no significant changes in juice quality with increasing P levels up to100 kg P2O5 ha-1. Results clearly showing the synergistic effect of P on nutrient uptake and use efficiency of all the macro nutrients as evidenced with macro nutrient build up in soils with increasing P levels. The findings of this study would help in reduction of 50 % P fertilizer dose under high P soils for achieving desirable yield levels and will in turn reduce the expenditure on P fertilizers without compromising cane yield, sugar yield, juice quality and soil fertility status.
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