Can Paddy-Compost Eliminate N Fertilization for Climate-Smart Sugarcane?

Bhatt, Rajan; Jamwal, Navdeep S.

doi:10.1007/s12355-023-01270-3

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…However, the experiment conducted by Huang et al (2023) to study the rice crop response under different combinations of paddy straw compost with chemical fertilizer reported that 10% replacement of chemical fertilizer with paddy straw compost resulted in higher rice yield and also increased microbial diversity compared to 100% chemical fertilizer. Bhatt et al (2023) also reported significantly higher sugarcane yield and quality parameters under 25% higher than the recommended dose of fertilizer + 5.5 quintal paddy straw compost ha −1 in sandy loam N-deficient soils of Kapurthala district of Punjab, India. On the other hand, Byeon et al (2023) revealed that soil organic carbon was highest in the NPK + rice straw compost at 30 t ha −1 treatment compared to NPK alone treatment.…”

Section: Discussionmentioning

confidence: 89%

Residue recycling options and their implications for sustainable nitrogen management in rice–wheat agroecosystems

Bhardwaj,

Malik,

Rani

et al. 2023

Ecol Process

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Background In the Indo-Gangetic Plain, rice–wheat is the most extensively practiced crop rotation. The escalating issue of crop residue burning, particularly rice straw, and the necessity to lower the exorbitant expenses associated with fertilizer inputs stand out as significant challenges for farmers in the region. A well-suited integrated nutrient management (INM) strategy that focuses on recycling crop residues can serve as a solution to address these issues. Such a strategy not only mitigates air pollution resulting from residue burning but also helps combat water pollution due to nitrate losses from agroecosystems. Field experiments were used to evaluate the suitability of eight INM-modules that included various combinations of inorganic fertilizer rates (50%, 100%, 150% of recommended dose), crop residues (wheat and rice stubble retention at 30 cm standing stubble equivalent to 1/3 the straw yield), rice straw compost (RSC), farmyard manure (FYM), and green manuring (GM), compared to 100% recommended dose of fertilizers (F) and no fertilizer application. Results There was a considerable improvement in nitrogen mineralization, grain yields, and nitrogen use efficiency under GM + RSC-F50 and GM + FYM-F50. These INM modules would permit a 50% reduction in the use of chemical fertilizers. There was a little yield penalty with in situ rice residue incorporation at 100% F; however, this could be overcome with 150% F fertilizer application. In situ retention of wheat straw with a full application of fertilizer resulted in steadily rising crop yields over time. Changes in the redox potential, soil pH, and soil organic carbon best accounted for the observed trajectories in nitrogen use efficiency. Conclusion The most promising INM modules for adoption by farmers in the Indo-Gangetic Plain to judiciously use crop residues and curtail chemical fertilizer inputs are green manuring with Sesbania aculeata + rice straw compost at 5 t ha−1 + only 50% of recommended dose of fertilizers (GM + RSC-F50), and green manuring with Sesbania aculeata + farmyard manure at 5 t ha−1 + only 50% of recommended dose of fertilizers (GM + FYM-F50). Sole incorporation of crop residues without nitrogen augmentation from other sources might not help curtail chemical fertilizer use. Composting rice straw, which otherwise is widely burnt, proved a useful nitrogen source and a vital component of INM. Waste rice straw composting at the community scale and its application as a nutrient source can help achieve sustainable nitrogen management in the agroecosystems of Indo-Gangetic Plain.

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Section: Discussionmentioning

confidence: 89%