Soil is the largest terrestrial sink of Carbon (C). Carbon sequestration in soil is important for soil quality as well as to mitigate CO2 loading in atmosphere. Study on C of surface soil layer is going on for long time. Only in the recent past, scientists have noticed the importance of subsoil as a store house of stable C. On the contrary, study of C dynamics in tropical rice soil is important in countries like India where rice is the predominant crop and soil C sequestration is at risk due to high temperature. In this context, this study tried to understand the dynamics of soil C in deep soil under rice and non-rice ecology. Three distinct long term experimental sites were selected for soil sampling from three eastern states of India. Results indicated high total C and total organic C in surface soil in comparison to subsoil. On the other hand, rice soils had higher C than non-rice soil. The soil C was further divided into labile and recalcitrant pools using water extraction. As per water solubility, water soluble (room temperature) and hot water
SummaryThe yield of wheat ranged from 29.16 to 45.14 and 29.56 to 49.14 q ha -1 during 2005-06 and 2006-07, respectively was influenced significantly by different treatments. During 2005-06 maximum grain yield (45.14 q ha -1 ) was recorded in case of treatment T 10 (3 tonnes vermicompost + 100% NPK of RDF), where 100% NPK with vermicompost @ 3.0 t ha -1 was applied, was found statistically at par with treatment T 7 (3 tonnes vermicompost +75% NPK of RDF), where vermicompost @ 3.0 t ha -1 was applied with 75% NPK and significantly higher than the rest of the treatment. Similar trend of treatments effect on grain yield was also obtained during second year i.e. 2006-07. With exception of T 2 (one tonne vermicompost + 50% NPK of RDF), grain yield recorded in T 1 (150: 60: 40: as NPK, recommended dose of fertilizers), where 100% NPK was supplemented through inorganic source was found significantly lower than the rest of the treatments. Graded does of vermicompost with similar does of NPK influenced the grain yield of wheat significantly during both the years with exception of T 8 (one tonnes vermicompost +100% NPK of RDF) and T 9 (two tonnes vermicompost + 100% NPK of RDF). Results revealed that 50% NPK can be substituted by the application of @1.0 t ha -1 vermicompost as the grain yield recorded in T 1 (150: 60: 40: as NPK, recommended dose of fertilizers) and T 2 (one tonne vermicompost + 50% NPK of RDF), was statistically similar while grain yield increased significantly due to application of vermicompost @ 2.0 t ha -1 with 50% NPK. Application of different does of vermicompost with 75% NPK yielded significantly higher than the T 1 (150: 60: 40: as NPK, recommended dose of fertilizers), where only 100% NPK was applied during both the years. No significantly variation in grain yield of wheat was found between the treatments having application of 1 t ha -1 vermicompost with either 50% or 75% NPK but yield varied significantly between treatments having the application of 1 t ha -1 vermicompost with 50% or 100% NPK. Similarly no variation was also found between T 3 (two tonne vermicompost + 50% NPK of RDF) and T 6 (two tonne vermicompost + 75% NPK of RDF) and T 4 (three tonne vermicompost + 50% NPK of RDF) and T 7 (three tonnes vermicompost +75% NPK of RDF), while T 4 (three tonne vermicompost + 50% NPK of RDF) and T 10 (three tonnes vermicompost + 100% NPK of RDF), varied significantly during both the years. This implies that application of 3.0 t ha -1 of vermicompost along with 75% NPK is a better combination for optimum crop yield. This combination also enhanced the physical, chemical properties of soil by improving the availability of different nutrients.
The field experiment was carried out during Khairf 2022 at Crop Research Farm, Department of Agronomy, SHUATS, Prayagraj (U.P), to study the “effect of phosphorus and micronutrients on yield and economics of rice (Oryza sativa L.)”. The experiment was laid out in Randomized Block Design with ten treatments including control each replicated thrice. Significantly higher grain yield (6.20 t/ha) and straw yield (8.37 t/ha) were recorded in treatment 9 with application of Phosphorus 60 kg/ha + Zinc 5 kg/ha + Boron 2 kg/ha. Higher gross returns (1,34,890.00 INR/ha), net return (88,765,20 INR/ha) and benefit cost ratio (1.92) were obtained in the treatment of Phosphorus 60 kg/ha + Zinc 5 kg/ha + Boron 2 kg/ha.
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