Date Received: 20-02-2014
Date Accepted: 27-03-2014
Date Published: 06-08-2025
##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2014.12.2.
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Photosynthesis, Dry Matter Accumulation and Grain Yield of A Short Growth Duration Rice Line DCG66 under Different Nitrogen Levels and Transplanting Densities
,
Nguyen Thi Hien
,
Doan Cong Dien
,
Do Thi Huong
,
Vu Hong Quang
,
Pham Van Cuong
Keywords
dry matter accumulation, grain yield, nitrogen, photosynthesis, short growth duration rice
Abstract
The purposes of this study were (i) to compare the characters of photosynthesis and dry matter accumulation of the new promising short growth duration rice line DCG66 and check variety Khang Dan 18 (KD18) under two nitrogen levels: 0.5 g N/pot and 1.0 g N/pot in 2013 spring season in green house of Hanoi University of Agriculture and (ii) to evaluate the grain yield of DCG66 under four nitrogen levels: 80 kg N/ha,,100 kg N/ha, 120 kg N/ha and 140 kg N/ha and three transplanting densities: 25 hill/m2, 35 hill/m2 and 45 hill/m2 in both Spring and Autumn cropping seasons in Thai Nguyen and Lao Cai provinces. The results of pot experiment showed that there was no significant difference in the maximum of tillers per hill between two cultivars but leaf area was significantly higher in DCG66 than that in KD18 under both nitrogen treatments. CO2 exchange rate (CER) was similar between two cultivars at tillering stage but significantly higher in DCG66 in the dough-ripening stage under both nitrogen levels. There were closer positive correlations between CER and stomatal conductance at tillering stage and between CER and leaf nitrogen content at dough-ripening stage in DCG66 than those in KD18. At the tillering stage, total dry matter weight (DM) was significantly greater in DCG66 than that in KD18 due to higher DM of each part such as roots, culms and leaves under both nitrogen treatments. At dough ripening stage, total DM was not significantly different between two cultivars, but DM of leaves and panicles were higher in DCG66 than those in KD18. Individual grain yield was similar between two cultivars under the lower nitrogen condition but significantly higher in DCG66 than that in KD18 under high nitrogen condition due to higher number of panicles per hill. The results of field experiments showed that the grain yield of DCG66 was the highest in treatment with 120kg N/ha and 35 hills/m2 in Thai Nguyen (6.33 tons/ha in Spring season and 7.03 tons/ha in Autumn season) and in treatment with 100 kg N/ha and 45 hills/m2 in Lao Cai (6.24 tons/ha in Spring season and 6.49 tons/ha in Autumn season).
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