Increasing nutrient use efficiency in rice with changing needs

摘要: The use of N fertilizer in Asia has increased from 24 to 39% the world's total consumption between 1973 and 1987/88. Approximately 60% consumed is used on rice (Oryza sativa L.). However, applied rice, primarily as urea, not effectively utilized by crop. Ammonia volatilization recognized a major mechanism loss, causing ineffective utilization. Basal incorporation urea without standing water; deep placement urea; modification with algicides, inhibitors or coatings are strategies reduce ammonia loss. Loss nitrification-denitrification may be serious problem particularly when soil dried crops, then flooded for subsequent organic sources, such green manure manures, partial substitutes inorganic receiving renewed research interest.