Search Results - "Samson, M.I."

Nitrogen-use efficiency in tropical lowland rice systems: contributions from indigenous and applied nitrogen by Cassman, K.G., Gines, G.C., Dizon, M.A., Samson, M.I., Alcantara, J.M.

“…Partial factor productivity (P fp) from N fertilizer is the ratio of grain yield to the applied N rate. It is a parameter that includes contributions to N-use…”
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Soil organic matter and the indigenous nitrogen supply of intensive irrigated rice systems in the tropics by Cassman, K.G., Dobermann, A., Sta Cruz, P.C., Gines, G.C., Samson, M.I., Descalsota, J.P., Alcantara, J.M., Dizon, M.A., Olk, D.C.

“…Soil organic matter (SOM) has been proposed as an index of N supply in paddy soils although field validations are few. We evaluated the relationship between…”
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Crop rotation and residue management effects on carbon sequestration, nitrogen cycling and productivity of irrigated rice systems by Witt, C., Cassman, K.G., Olk, D.C., Biker, U., Liboon, S.P., Samson, M.I., Ottow, J.C.G.

“…The effects of soil aeration, N fertilizer, and crop residue management on crop performance, soil N supply, organic carbon (C) and nitrogen (N) content were…”
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Inhibition of nitrogen mineralization in young humic fractions by anaerobic decomposition of rice crop residues by Olk, D.C, Samson, M.I, Gapas, P

“…Field observations indicate a long-term decrease in crop uptake of N derived from soil organic matter under continuous production of irrigated lowland rice…”
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Direct measurement of ammonia and denitrification fluxes from urea applied to rice by De Datta, S.K. (International Rice Research Inst., Manila, Philippines), Buresh, R.J, Samson, M.I, Obcemea, W.N, Real, J.G

“…Ammonia volatilization and denitrification are widely reported to be mechanisms of fertilizer-N loss from lowland rice fields, but few researchers have…”
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Dinitrogen and nitrous oxide flux from urea basally applied to puddled rice soils by Buresh, R. J., De Datta, S. K., Samson, M. I., Phongpan, Sakorn, Snitwongse, Patoom, Fagi, A. M., Tejasarwana, R.

“…Nitrification-denitrification is often regarded as an important N loss process in puddled rice soils, but few direct field measurements of denitrification loss…”
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Nitrogen use efficiency and nitrogen-15 balances in broadcast-seeded flooded and transplanted rice by De Datta, S.K, Buresh, R.J, Samson, M.I, Kai-Rong, W

“…Increased irrigated areas, availability of short-duration modern rices (Oryza sativa L.) and cost-efficient herbicides, and high labor cost have motivated…”
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Effect of two urease inhibitors on floodwater ammonia following urea application to lowland rice by Buresh, R.J, De Datta, S.K, Padilla, J.L, Samson, M.I

“…One proposed strategy for overcoming N loss by ammonia volatilization from urea applied to flooded rice (Oryza sativa L.) fields is to amend urea with a urease…”
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