Growth Competition between Rice (Oryza sativa) and Barnyardgrass (Echinochloa oryzicola) under Varying Mono-/Mixed Cropping Patterns and Air Temperatures
Md. Shahidul Haque Bir,
Md. Arshad Ali,
Most Mohshina Aktar
et al.
Abstract:Increase in the concentration of atmospheric greenhouse gases significantly contributes to global warming, representing a substantial challenge for crop production. The study was conducted to determine the growth competition between rice (Oryza sativa) and barnyardgrass (Echinochloa oryzicola) under (i) different cropping patterns and (ii) elevated air temperatures in phytotrons under field condition, at two plant densities (4 and 16 plants per pot). Rice and barnyardgrass were planted with varying cropping pa… Show more
One strategy currently being developed to increase rice (Oryza sativa L.) productivity is using a multi‐canopy cropping system in rice cultivation. This method involves planting tall and short rice genotypes in the same hill. The objective of this experiment was to estimate the genetic parameters and response to selection in multi‐canopy rice. Each experiment was arranged in an augmented randomized complete block design with five replications for the checks. In the first planting season, 200 F3 families from IPB196 and IPB197 populations were planted in monoculture and multi‐canopy as the short genotypes. IPB187‐F‐40‐1‐1 was used in multi‐canopy as the tall genotype. Selection of 25% based on grain weight per hill of short genotype in multi‐canopy was performed, and 50 families were selected and their F4 seeds were planted in the second season along with the same tall genotype. The results indicated the genotype × cropping system was significant for grain weight per hill in the F3 and F4 generations. Grain weight per hill has a similar realized h2ns in the multi‐canopy (0.58) with monoculture (0.54). Meanwhile, the response to selection in multi‐canopy (3.60) was higher compared to monoculture (2.09), and therefore the selection of rice lines for a multi‐canopy system should be conducted in the multi‐canopy environment. A selection percentage of 5% resulted in a higher response to selection. These findings may provide insight into the acceleration of breeding rice varieties for the multi‐canopy system.
One strategy currently being developed to increase rice (Oryza sativa L.) productivity is using a multi‐canopy cropping system in rice cultivation. This method involves planting tall and short rice genotypes in the same hill. The objective of this experiment was to estimate the genetic parameters and response to selection in multi‐canopy rice. Each experiment was arranged in an augmented randomized complete block design with five replications for the checks. In the first planting season, 200 F3 families from IPB196 and IPB197 populations were planted in monoculture and multi‐canopy as the short genotypes. IPB187‐F‐40‐1‐1 was used in multi‐canopy as the tall genotype. Selection of 25% based on grain weight per hill of short genotype in multi‐canopy was performed, and 50 families were selected and their F4 seeds were planted in the second season along with the same tall genotype. The results indicated the genotype × cropping system was significant for grain weight per hill in the F3 and F4 generations. Grain weight per hill has a similar realized h2ns in the multi‐canopy (0.58) with monoculture (0.54). Meanwhile, the response to selection in multi‐canopy (3.60) was higher compared to monoculture (2.09), and therefore the selection of rice lines for a multi‐canopy system should be conducted in the multi‐canopy environment. A selection percentage of 5% resulted in a higher response to selection. These findings may provide insight into the acceleration of breeding rice varieties for the multi‐canopy system.
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