Site-specific nutrient management enhances sink size, a major yield constraint in rainfed lowland rice

A - Papers appearing in refereed journals

Banayo, N. P. M. C., Bueno, C. S., Haefele, S. M., Desamero, N. V. and Kato, Y. 2018. Site-specific nutrient management enhances sink size, a major yield constraint in rainfed lowland rice. Field Crops Research. 224 (1 July), pp. 76-79.

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

Nutrient management can increase crop yield and income, but its effects on yield components are rarely dissected in on-farm research. In this study, we compared aboveground biomass and yield components of rainfed lowland rice under site-specific nutrient management and farmer management from 69 demonstration sites prone to mild to moderate intermittent drought across 9 Philippine provinces over 3 years (the 2011–2013 wet seasons). The sink size (spikelets m−2) was most closely associated with grain yield in all years. Panicle size (spikelets per panicle) increased by 10.4% and 13.0% in 2011 and 2012, respectively, under site-specific nutrient management, with N application around the early reproductive stage of <25 kg N ha−1 in farmer nutrient management versus 30–33 kg N ha−1 in site-specific management. Higher N application during seedling establishment in farmer nutrient management (55 kg N ha−1) than in site-specific management (22 kg N ha−1) did not increase panicles m−2 in any year. Our results demonstrate the yield advantage of site-specific nutrient management in rainfed lowland rice in relatively fertile and less drought-prone environments: enhancing sink size should be the major target of nutrient management; it is unnecessary to apply high amounts of N during seedling establishment to secure a sufficient panicle number; and N application is most important during the early reproductive stage to increase panicle size.

Year of Publication2018
JournalField Crops Research
Journal citation224 (1 July), pp. 76-79
Digital Object Identifier (DOI)doi:10.1016/j.fcr.2018.05.006
Open accessPublished as non-open access
Output statusPublished
Publication dates
Online24 May 2018
Publication process dates
Accepted07 May 2018
ISSN0378-4290
PublisherElsevier Science Bv

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