On-farm assessment of site-specific nutrient management for rainfed lowland rice in the Philippines

A - Papers appearing in refereed journals

Banayo, N. P. M. C., Haefele, S. M., Desamero, N. V. and Kato, Y. 2017. On-farm assessment of site-specific nutrient management for rainfed lowland rice in the Philippines. Field Crops Research. 220, pp. 88-96.

AuthorsBanayo, N. P. M. C., Haefele, S. M., Desamero, N. V. and Kato, Y.
Abstract

Rice yield in the drought-prone rainfed lowlands is constrained by low availability of nutrients and water. Fertilizer applications currently conducted by farmers may not match the crop demands nor be resource-use efficient. The objective of this study was to characterize the farmers’ practices of nutrient management (FP) in rainfed lowland environments, and compare it with the site-specific nutrient management guideline by using decision-support software (Rice Crop Manager; RCM) in terms of rice yield and production cost. On-farm trials were conducted in northern Philippines in the wet seasons of 2011–2014. Average application rate of N, P and K in RCM was 82, 10 and 21kgha−1, respectively, while the application rate was 93, 11 and 18kgha−1 in FP (n=93). Grain yield in FP, which ranged from 1.82 to 6.49tha−1, was significantly enhanced by RCM by 6% on average (4.48 vs. 4.22tha−1). The yield difference was mainly associated with the different N application regimes in RCM and FP. Average number of N applications was 1.94 in FP with 52% of total N applied during the first 15days after transplanting while there were 2.63 applications in RCM with 29% applied during the first 15days after transplanting and 44% at panicle initiation, respectively. Total cost for fertilizer was comparable or lower in RCM than FP, and hence the net income was increased by 154 US$ ha−1. The results of this study showed that site-specific nutrient management improved productivity and profitability in rainfed lowlands of the Philippines.

Year of Publication2017
JournalField Crops Research
Journal citation220, pp. 88-96
Digital Object Identifier (DOI)doi:10.1016/j.fcr.2017.09.011
Open accessPublished as non-open access
Output statusPublished
Publication dates
Online14 Sep 2017
Publication process dates
Accepted08 Sep 2017
ISSN03784290
PublisherElsevier
Copyright licensePublisher copyright

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