Increasing urea-N efficiency in transplanted lowland rice by urea solution band placement

Devasenapathy, P.; SP, PALANIAPPAN

doi:10.1007/bf00382526

Cited by 1 publication

(1 citation statement)

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“…The buildup of ammoniacal N in fl oodwater can be reduced by more eff ective incorporation and placement of fertilizer N into puddled soils Schnier et al, 1990Schnier et al, , 1993Devasenapathy and Palaniappan, 1996), application of fertilizer N immediately before rather than aft er permanent fl ooding in nonpuddled soils (Bacon et al, 1988;Humphreys et al, 1992), controlled release fertilizers (Oertli, 1980), and urease inhibitors (Buresh et al, 1988a(Buresh et al, , 1988bByrnes and Amberger, 1989;Freney, 1997). The application of fertilizer N immediately before rather than 14 d before permanent fl ooding reduces NH 3 loss during production of dry-seeded rice on nonpuddled soils (Griggs et al, 2007).…”

Section: Ammonia Volatilizationmentioning

confidence: 99%

Nitrogen Transformations in Submerged Soils

Buresh

Reddy

Kessel

2015

Agronomy Monographs

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Soils with continuous or intermitt ent submergence by water are widely distributed worldwide. They occur in a range of ecosystems including rice (Oryza sativa L.) fi elds, wetlands, estuaries, and fl oodplains. Such ecosystems oft en occur at low elevation in the landscape and are poorly drained with high retention of water. In addition, some upland areas with poor drainage can undergo periodic submergence and soil saturation. Moreover, the sediments in ocean, lake, and stream bottoms have similar biogeochemical and physical characteristics and N transformations as submerged agricultural soils.Rice fi elds surrounded by earthen levees to retain rain and irrigation water and ensure soil submergence are one of the world's major agricultural ecosystems. Rice is a staple food for nearly half the world's population, and about 95% of the global rice production occurs on fi elds with soil submerged during at least part of the rice-cropping period. The sustained productivity of this rice ecosystem, which ensures production of suffi cient food for a growing world population, relies heavily on the input and management of N.Nitrogen transformations in submerged soils are markedly diff erent from those in drained, aerated soils. These diff erences aff ect the prevalent soil microorganisms and microbial activities and the turnover, availabilility, and losses of N. To deal with the diff erences in N transformations between submerged and drained soils it is necessary to understand the biogeochemical conditions existing in submerged soils. This chapter is an update of an earlier review by Patrick (1982).

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