Search

A field experiment was conducted at the Department of Rice, Tamil Nadu Agricultural University, Coimbatore-3 during Kharif season, 2017. The objective of the experiment was to study the influence of Zinc nutrition on growth, physiology, ZUE, yield and grain Zn content of rice genotypes at two stages of crop. The experiment was laid out in a factorial randomized block design with three replications. The results of the field study revealed the maximum total tillers per plant were observed in the rice genotype IR93354:19-B-12-21-9-1RGA-2RGA-1-B under 0.5% ZnSO4 condition at the grain filling stage. However the higher total dry matter production recorded in the genotype IR15M1266 under 0.5% ZnSO4 treatment. Regarding zinc use efficiency indices, the maximum zinc use efficiency (42.2%) was observed in the foliar application of 0.5% ZnSO4 in rice genotype IR14M117 followed by BPT5204 (39.0%). The higher spikelet fertility was observed in BPT5204 (98.2%) under foliar application of 0.5% ZnSO4 was followed by Kalanamak (97.3%) on par with Chittmutyalu (97.2%) was under 0.5% ZnSO4 application. The treatment 0.5% ZnSO4 had recorded higher grain yield (8870.0 kg/ha) in IR95097:3-B-16-11-4-GBS which was on par with IR14M124 (8800 kg/ha). To conclude, when foliar sprayed with zinc sources such as 0.5% ZnSO4 and 0.5% Zn EDTA at boot leaf and grain filling stage in rice genotypes like IR15M1003, IR95097:3-B-16-11-4-GBS, IR95040:12-B-3-10-GBS, IR15M1341 and IR95097:4-B-2-18-8-GBS showed significant changes in growth, physiology and zinc grain content. [ABSTRACT FROM AUTHOR]

An experiment was conducted to study the rice genotypes for nitrogen use efficiency at the Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore during Kharif, 2017. Forty rice genotypes were used for this study with two nitrogen levels viz., 50% Recommended Dose of Nitrogen (RDN) and 100% RDN and the experiment was laid out in Factorial Randomized Block Design with two replications. The rice genotypes were subjected to 100% RDN and 50% RDN and various morpho-physiological, biochemical and yield traits were observed. Among the genotypes, IRGC 6386-1 showed higher photosynthetic rate at 100% RDN and 50% RDN followed by WAS 169. Similarly, higher grain yield per plant was noticed in IRGC 6386-1 at 100% RDN (60.22 g) and 50% RDN (58.41 g). From the results, it is evident that the increased amount of nitrogen could enhance the growth dynamics and yield attributes of rice genotypes. However, the present study demonstrated that certain genotypes had performed better even at 50% RDN in terms of growth characters and yield attributes. [ABSTRACT FROM AUTHOR]

An experiment was conducted to study the photosynthetic efficiency of rice genotypes and mutants at the Glass house, Department of Crop Physiology, TNAU, Coimbatore. The physiological and biochemical parameters viz., chlorophyll index, photosynthetic rate, chlorophyll fluorescence and soluble protein content were measured at different growth stages which depicted the relative ability of the genotypes to the photosynthetic efficiency. Significant variation in the photosynthetic characters among the rice genotypes was noticed in the experimental results. Among the two mutants studied for photosynthetic efficiency the mutant 377-1-1 performed better than the mutant 277-2 due to its superiority in certain morpho-physiological, anatomical and biochemical traits which ultimately contributed for better yield. Hence, the mutant 377-1-1 can be recommended for crop improvement programme for developing elite cultivars with better photosynthetic efficiency and yield. [ABSTRACT FROM AUTHOR]

Forty two Indian clusterbean genotypes were subjected to biochemical characterization. Biochemical profiling revealed the presence of ample amount of variation for crude protein, crude fibre, crude fat, ash, carbohydrate and guar gum content. Correlation analysis among the profiles expressed crude fibre positively and significantly correlated with ash content, but negatively and significantly correlated with crude protein. Carbohydrate showed significant and negative correlation with crude protein. Gum content showed positive and significant correlation with crude protein, but negative association with ash and carbohydrate content. High crude fat and ash content was found in the genotypes namely Amrit11, PNB, HVG2-30, T local and M local. These genotypes can be used for vegetable purpose as their length of the pod is higher than other genotypes. The genotype HFG119 has recorded high crude fat, ash and fibre content, which are the reasons attributed for the suitability as a fodder. Genotypes namely HGS16, RGC 1066, RGC1033, GAU 513, HGS870, MRSG6, RGM 1, RGC1002, SRG1008 suitable for gum extraction, after that they can be used for guar meal. Clustering based on proximate analysis distinguished the entire genotypes into gum producing and non gum producing genotypes. [ABSTRACT FROM AUTHOR]