Strip planting decreases nitrogen fertilizer requirements while retention of more residue increases them in a rice - wheat - mungbean sequence on a subtropical floodplain soil

Kader, Md. Abdul and Jahiruddin, M. and Islam, M.R. and Haque, M.E. and Hasan, M.S. and Karmakar, S. and Ali, M.M. and Bell, R.W. (2016) Strip planting decreases nitrogen fertilizer requirements while retention of more residue increases them in a rice - wheat - mungbean sequence on a subtropical floodplain soil. [Conference Proceedings]

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Abstract

Conservation agriculture (CA) has not been well developed for intensively cultivated (2-3 crops yr-1) rice- based cropping systems which produce large amounts of crop residues annually. Thus, we examined the effects of two crop establishment systems (minimum soil disturbance by strip planting (SP) or conventional tillage (CT)), two residue retention levels (low and high) and five N rates (60, 80, 100, 120 & 140% of the recommended N fertilizer doses (RFD) on nine consecutive crops on an Aeric Haplaquept under rice-wheat- mungbean sequence. Rice yields were comparable between the crop establishment types but system yields were significantly higher with SP in two out of three years compare to CT. Increased residue retention did not significantly influence rice yield but positively influenced system yields. No substantial differences in optimum N rate was estimated between CT and SP for 90% of maximum yield goal (MYG) for all the three years but substantially decreased in SP compared to CT in two out of three years for 95 and 99% of MYG. The N fertilizer requirement was 6-22% higher with high residue retention compared to low residue retention plots for all the three yield goal levels. High residue retention also increased soil organic carbon (SOC) at 0- 6 cm depth in both tillage treatments. In conclusion, introducing CA did not alter the N fertilizer requirements of rice for 90% of MYG but reduced the requirement for 95 and 99% of MYG compared to CT. However, there was evidence that the retained crop residue immobilized N and increased the fertilizer N requirement.

Item Type:	Conference Proceedings
Subjects:	S Agriculture > S Agriculture (General)
Divisions:	Faculty of Business and Economics (FBE) > School of Agriculture and Food Technology
Depositing User:	Md. Abdul Kader
Date Deposited:	08 Jun 2018 00:09
Last Modified:	08 Jun 2018 00:09
URI:	http://repository.usp.ac.fj/id/eprint/10821

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