Effect of blast and water deficit on yield components in the upland rice cultivar C-22
1987
Sanchez, L.M. | Mackill, A.O. | Bonman, J.M. (International Rice Research Inst., Los Banos, Laguna (Philippines))
An experiment with two blast levels (low and high) and two water levels (fully irrigated and stressed from 42 to 58 days after seeding) was conducted using the upland cv C22. Microclimate and plant mineral nutrient contents were also determined. No interaction between water level and blast level was detected. Highest disease occurred in water-stressed inoculated plots with 4% diseased leaf area and 44% severe neck blast. The highest gain yield was obtained in protected, fully-watered plots (2.23 t/ha) and (1 t/ha). Blast and water deficit cause additive reduction in 1000-grain weight, percentage filled grains, and total dry matter. Plant tissue analysis showed that plants in water stressed plots had higher percent N and lower percent S1O2 content compared to plants in irrigated plots. Microclimate was more favorable for diseased development in the irrigated plots than in the water-stressed plots because of a longer period of leaf wetness. However, after full irrigation was restored, disease increased faster in plants that had been stressed. Higher disease observed later in the stressed plots was not due to microclimate differences between plants but was probably due to increased susceptibility of the stressed plants.
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