scholarly journals The resistance and its inspecting method of injuries of cool weather in the rice varieties : IV Varietal differences in the injuries at the stage of premordial panicle development

1947 ◽  
Vol 17 (2) ◽  
pp. 7-8
Author(s):  
Yorimi Kondo
Keyword(s):  
Rice Varieties ◽  
Varietal Differences ◽  
Panicle Development

scholarly journals Changes in microbial biomass and grain yield of rice varieties in response to the alternate wet and dry water regime in the inland valley of derived savanna

2019 ◽  
Vol 64 (3) ◽  
pp. 239-253
Author(s):  
Adeniyi Soretire ◽  
Olalekan Sakariyawo ◽  
Oyinkansola Yewande ◽  
John Adesodun ◽  
Aderonke Akintokun ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Grain Yield ◽  
Water Regime ◽  
Field Experiments ◽  
Lowland Rice ◽  
Microbial Count ◽  
Rice Varieties ◽  
Microbial Biomass Nitrogen ◽  
Varietal Differences ◽  
Derived Savanna

This investigation tested the hypothesis that the alternate wet and dry (AWD) water regime would increase soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial count. Variations in MBC, MBN and grain yield could be due to varietal differences in a derived savanna. Experiments (both pot and field ones) were conducted at the Federal University of Agriculture, Abeokuta (Latitude 7? 12? to 7? 20? N and Longitude 3? 20? to 3? 28? E), Nigeria in 2015. In both trials, the treatments consisted of water regimes (continuous flooding [control] and AWD imposed on lowland rice varieties [NERICA?L-19])and Ofada [local check] at the vegetative growth stage in three cycles. The design in both trials was a completely randomised and randomised complete block design for the pot and field experiments respectively, with three replicates. In the screen house, MBC and MBN were significantly higher in AWD than in continuously flooded soil, especially at the beginning of the AWD cycles. This could have caused nutrient pulses to sustain the improved performance of lowland rice under AWD. A converse pattern was observed in the field in the third cycle. Ofada rice had a significantly higher microbial count and MBC (cycle 1) than NERICA L-19, however, a converse pattern was observed in MBC (cycles 2 and 3) and MBN (cycle 1). Composition of their rhizodeposition and timing of cycles could explain the observed varietal differences in MBC and MBN.

Metabolite Contents and Panicle Development in Indica Rice Varieties Belonging to Different Growth Duration Groups

1992 ◽  
Vol 19 (2) ◽  
pp. 185 ◽  
Author(s):  
SK Sahu ◽  
PK Mohapatra
Keyword(s):  
Grain Yield ◽  
Partial Correlation ◽  
Indica Rice ◽  
Peak Level ◽  
Grain Filling ◽  
Soluble Carbohydrates ◽  
Growth Duration ◽  
Rice Varieties ◽  
Panicle Development ◽  
Check Variety

Growth, spikelet number and assimilate contents of the panicle on the mainshoot of 20 indica rice varieties consisting of four duration groups were measured at intervals during the period between 2 weeks prior to anthesis and maturity. Panicle development was of longer duration in the late maturing varieties than in the early, and grain yield of the former was more than that of the latter due to difference in grain number. Shifting the cultivation of an early duration check variety to match the time of reproductive development in the medium duration group did not change its pattern of development. During development, the concentration of soluble carbohydrates, amino acids and phosphates changed significantly with time, and the pattern was the same in all varieties. Initially the concentration was low, but increased sharply a few days before anthesis to a peak level, then declined until anthesis. After anthesis it decreased to a minimum at maturity. Pre-anthesis metabolite concentration of the panicle was higher in the late varieties than in the early varieties, but not much difference was observed post-anthesis. Growth durations of the vegetative, reproductive and grain filling periods collectively influenced grain yield but, on the basis of partial correlation analysis, the vegetative duration was found most important for yield.

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