Using rice crop parameters to differentiate two upland sites
1990
Kuerschner, E.M. | Pabale, D.L. | Bonman, J.M. (International Rice Research Inst., Los Banos, Laguna (Philippines))
The occurrence and severity of blast disease in upland rice varies greatly among sites. Site properties at the same time affect crop growth which in turn interacts with blast disease. A range of crop parameters to assess site specific effects within the upland rice ecosystem was measured. Crop development (tillers/sq.m filled spikelets/panicle, percentage of unfilled spikelets) in field plots during wet season 1987-1989 at two upland sites in the Philippines (Sto. Tomas, Batangas, and Cavinti, Laguna) were recorded. The sites differ in their edaphoclimatic characteristics. Tiller number during vegetative growth and number of panicles at harvest did not differ between sites, but varied between years. Canopies were higher, whereas canopy cover was lower at Sto. Tomas compared to Cavinti, however, site-year interactions were significant. Among the yield parameters, total dry matter and percentage unfilled spikelets showed a site-year interaction. Consistently over the three years, total dry matter grain yield and 1000 grain weight were higher, and percentage of unfilled spikelets was lower at Sto. Tomas, the site with higher fertility. Relations of crop growth variables and yield, and possible interactions of crop variables and blast disease are presented.
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