Yield and soil organic carbon pool in relation to soil fertility of sugarcane (Saccharum species hybrid complex) plant-ratoon system under integrated nutrient management

S.K. SINHA; C.K. JHA; VIPIN KUMAR; S.S. PANDEY

doi:10.59797/ija.v62i1.4269

Authors

S.K. SINHA
C.K. JHA
VIPIN KUMAR
S.S. PANDEY

DOI:

https://doi.org/10.59797/ija.v62i1.4269

Keywords:

Cane yield, Carbon pool, Integrated nutrient management, Soil fertility, Sugarcane

Abstract

A field experiment was conducted for consecutive 6 years ( from 200809 to 201314) at Pusa, Bihar, to evalu- ate the integrated effect of organic and inorganic fertilizer on soil organic carbon pool, nutrient status and produc- tivity of sugarcane (BO 137) plantratoon system in Typic Ustochrept. The application of organics, viz. farmyard manure (FYM), bio-compost and bio-methanated distillery effluent (BMDE), along with inorganic fertilizer (100% NPK) in canes plant and its residual effect in ratoon significantly increased number of millable cane, cane yield and sugar yield over the control. The highest increment in yield in plant (24.95%) and ratoon (16.05%) was ob- served in plots treated with BMDE @ 150 m3/ha. The mean uptake of nutrients (N, P, K and S) and sugar yield varied and followed the similar trends as cane yield. The soil organic carbon pool, viz. carbon storage (180.9 235.2 kg/m2), water-soluble carbon (52.882.4 mg/g), CO evolution (48.570.1 mg/100 g soil) and soil microbial 2 biomass carbon (88.7121 mg/g) varied significantly due to different treatments. The highest amount of soil or- ganic pools were recorded in treatments receiving BMDE (150 m3/ha) followed by bio-compost (20 t/ha) and the lowest being in the control. Integrated use of organics with inorganic fertilizers facilitated the accumulation of or- ganic carbon which in turn had significant increment effect on the soil carbon pool and fertility status (N, P, K and S) of soil with reduction in bulk density beneficial for sustaining productivity of sugarcane plant - ratoon system. Thus, it is imperative that application of either 100% NPK recommended dose of fertilizer along with bio-compost 20 t/ha or 100% NP along with bio-methanated distillery effluent 150 m3/ha (supplying 100% K) improved the fertil- ity of soil which were reflected in increased productivity of sugarcane plant-ratoon system.

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