3. RESULTS
3.1. Environmental Data
Effects of number of rainy days, rainfall, maximum and
minimum temperatures on grain production of upland
rice (Nangdam and Lebnok varieties) grown during the
rainy season (Fig. 1). The results showed that the rainfall
during the July to November, 2010 was found to be
deleterious for upland rice growth, yield and grain
quality. In vegetative, reproductive and grain formation
to ripening stages of rice plants received average monthly
rainfall ranges from 12.40 to 97.10 mm (Fig. 1a) with
average monthly temperatures ranges from 31.40 to
35.00°C (Fig. 1b). The two tested varieties got 12.40-59.20
mm of rainfall during vegetative stage, 57.40 mm in
reproductive stage, 97.10 mm in grain formation stage, with
number of 10, 7 and 12 raining days, respectively.
3.2. Growth Responses
Effect of drought condition on growth of Nangdam and
Lebnok varieties are presented in Fig. 2a. The
Nangdam was the plant high of 95.50 cm, days to
booting of 72 days, days to 50% flowering of 93 days and
days to harvesting of the grain of 122 days, but not
significantly different from those of Lebnok was the
plant high of 92cm, days to booting of 68 days, days
to 50% flowering of 90 days and days to harvesting of
120 days. The number of panicle per tiller was
affected by drought condition. There was no
significant difference in number of panicle per tiller
among the varieties had resembled number of panicle
per tiller of 4 panicle. All varieties had similar panicle
length ranges from 24.22 to 24.45cm.