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Long-term effects of urea and green manure on rice yields and nitrogen balance por Ladha, J.K., Dawe, D., Ventura, T.S., Singh, U., Ventura, W., Watanabe, I.

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Yield trends and apparent nutrient balances in intensified and diversified rice-based cropping systems por Pascua Jr, S.R., Ventura, W., Agustin, E.O., Padre, A.T., Valencia, D.A., Marcos, T.F., Sta. Cruz, Pompe C., Obien, S.R., Ladha, J.K.

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Sesbania phosphorus requirements when used as biofertilizer for long-term rice cultivation por Ventura, W., Ladha, J.K.

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Green Manure Production of Azolla microphylla and Sesbania rostrata and Their Long-Term Effects on Rice Yields and Soil Fertility por Ventura, W., Watanabe, I.

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Fate of Azolla spp. and Urea Nitrogen Applied to Wetland Rice (Oryza sativa L.) por Watanabe, I., Ventura, W., Mascariña, G., Eskew, D.L.

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Estimation of the Nitrogen Balance for Irrigated Rice and the Contribution of Phototrophic Nitrogen Fixation por App, A., Santiago, T., Daez, C., Menguito, C., Ventura, W., Tirol, A., Po, J., Watanabe, I., De Datta, S.K., Roger, P.

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