Improved upland rice cultivars perform well under low and high input management
2002
Lanceras, M.R. | Laza, M. | Atlin, G.N. (International Rice Research Inst., DAPO Box 7777, Metro Manila (Philippines))
Traditional upland rice cultivars are adapted to low-input production. Newly developed cultivars are more responsive to inputs, but there is concern that they may not perform well under low input conditions. An experiment was conducted comparing traditional upland rice cultivars from several countries including Philippines, Indonesia and India with improved cultivars at the IRRI upland farm on fertile, neutral soil and at Siniloan, an acid upland site in Southern Luzon, Philippines. The 40 cultivars were tested under high-input and low-input management in the wet and dry seasons. Results showed that several improved cultivars, including Philippine-developed varieties Apo, UPL Ri7, and CIAT line CT6510-24-1-2 were among the highest yielding cultivars under both low and high fertility. The results indicated that it is possible to develop upland rice cultivars combining tolerance to low fertility conditions with responsiveness to more favorable conditions. Such cultivars could permit upland rice growers to increase productivity through more intensive management without increasing risk in less fertile acid upland environments
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