Nitrogen (N) is a star nutrient for crop production. The uptake and assimilation of N are crucial steps for plant growth and development. This study aimed to evaluate the growth parameters of ten genotypes, namely HD 3226, HDCSW 18, HD 2967, HD 3086, HD 3249, HD 2733, PBW 550, PBW 343, HD 3117, and HD 3298, under varying levels of N [0, 50% (75 kg ha-1), and 100% (150 kg ha-1)] with the used of Neem oil coated urea in 2020 and 2021. The results showed that the different genotypes exhibited varying growth parameters, with plant height (PH), tiller numbers, and dry matter accumulation (DMA) being higher in 100% N as compared to the 50% and 0%. The results of this two-year study indicate that the average PH at 30 DAS and 90 DAS increased by 51.6% and 64.2% respectively with 50% RDN and by 17.6% and 22.18% respectively with 100% RDN, compared to the control. Similarly, the tiller numbers and DMA at 30 DAS increased by 20.4% and 26.5% respectively with 50% RDN, and by 37.5% and 51% respectively with 100% RDN, compared to the control. Among all genotypes, the highest PH (30 and 90 DAS) and DMA (30 DAS) were observed in genotype ‘HD-3249’, while the highest number of tillers (30 DAS) was observed in genotype ‘PBW-550’. The results of this study suggest that the genotypes ‘HD-3249’ and ‘PBW-550’, when application of 100% RDN, showed a promising response in terms of PH, DMA, and tillers numbers.
KEYWORDS: Rice genotypes, nitrogen levels, growth parameters
Nitrogen (N) is a star nutrient for crop production. The uptake and assimilation of N are crucial steps for plant growth and development. This study aimed to evaluate the growth parameters of ten genotypes, namely HD 3226, HDCSW 18, HD 2967, HD 3086, HD 3249, HD 2733, PBW 550, PBW 343, HD 3117, and HD 3298, under varying levels of N [0, 50% (75 kg ha-1), and 100% (150 kg ha-1)] with the used of Neem oil coated urea in 2020 and 2021. The results showed that the different genotypes exhibited varying growth parameters, with plant height (PH), tiller numbers, and dry matter accumulation (DMA) being higher in 100% N as compared to the 50% and 0%. The results of this two-year study indicate that the average PH at 30 DAS and 90 DAS increased by 51.6% and 64.2% respectively with 50% RDN and by 17.6% and 22.18% respectively with 100% RDN, compared to the control. Similarly, the tiller numbers and DMA at 30 DAS increased by 20.4% and 26.5% respectively with 50% RDN, and by 37.5% and 51% respectively with 100% RDN, compared to the control. Among all genotypes, the highest PH (30 and 90 DAS) and DMA (30 DAS) were observed in genotype ‘HD-3249’, while the highest number of tillers (30 DAS) was observed in genotype ‘PBW-550’. The results of this study suggest that the genotypes ‘HD-3249’ and ‘PBW-550’, when application of 100% RDN, showed a promising response in terms of PH, DMA, and tillers numbers.
KEYWORDS: Rice genotypes, nitrogen levels, growth parameters