Research Paper
Year: 2019 | Month: December | Volume: 6 | Issue: 12 | Pages: 172-184
Growth Response of Culm Habit Near-Isogenic Lines Rice (Oryza sativa L.) to Different Planting Densities and Nitrogen Regimes
Christian Tafere1, Kenji Irie2
1Ethiopian Institute of Agricultural Research (EIAR) and Fogera National Rice Research and Training Center (FNRRTC),
2Tokoy University of Agriculture
Corresponding Author: Christian Tafere
ABSTRACT
Cultivars of culm habit NILs rice achieved from the crossing of Taichung Native 1 and Norin 29 after four successive back crossing display different morphological culm habits. The trial initiated on ambitions to satiate the gaps about the enactment of culm habit Near-Isogenic Lines rice SC-E and SC-O under different planting densities and nitrogen regimes and to characterize the impact of planting densities and Nitrogen regimes on the growth response of culm habit NILs rice. NILs rice SC-E and SC-O were subjected two population densities, two plant spacing’s and two nitrogen regimes. Culm architecture resulted variation in yield and photosynthetic activity. Higher nitrogen fertilizer application increased grain yield and bio-mass production. Higher planting density had obtained higher leaf area index and Photosynthesis Active Radiation absorption. Higher planting density and 300 kg N ha-1 had gained strong correlation with grain yield of SC-E and SC-O. NILs rice at 3 seedlings planting population with 0.2*0.2m2 spacing and 300 kg ha-1 nitrogen fertilization were showed significantly higher positive correlation between leaf area and grain yield. SC-E had showed high chlorophyll content even during physiological maturity stage under high planting density and 300 kg N ha-1. Canopy photosynthesis potential increase for medium planting population density in SC-E culm habit NILs rice. Generally, culm architecture of Near-Isogenic Lines affects canopy photosynthesis and yield by influencing PAR, chlorophyll content, Leaf Area Index, Leaf Area and yield components. The growth and culm architecture of culm habit NILs rice strongly influenced by planting densities and nitrogen regimes.
Key words: Culm habit NILs, planting density, Nitrogen regime, PAR, Canopy photosynthesis
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