VARIABILITY AND GENETIC PARAMETERS FOR GRAIN YIELD AND ITS COMPONENTS AND KERNEL QUALITY ATTRIBURTES IN CMS BASED RICE HYBRIDS (ORYZA SATIVA L.)
The present investigation was under taken to study the extent of variability and genetic parameters with 16 parents and 48 hybrids for nine yield and its components and twenty five quality characters. The magnitude of difference between PCV and GCV was relatively low for all the traits, indicating less environmental influence. High GCV and PCV were recorded for harvest index, total number of productive tillers per plant and gelatinization temperature in parents and for total number of productive tillers per plant, number of grains per panicle, gelatinization temperature and amylose content in hybrids. High heritability coupled with high genetic advance as per cent of mean were recorded for gelatinization temperature, harvest index, total number of productive tillers per plant, number of grains per panicle, kernel length, kernel L/B ratio and grain yield per plant in case of parents and for gelatinization temperature, amylose content, total number of productive tillers per plant, number of grains per panicle and harvest index in case of hybrids indicating the additive gene effects in the genetic control of these traits and can be improved by simple selection in the present breeding material.
Genetic variability in grain quality characteristics and yield in lowland rice genotypes
Grain quality characteristics of 20 promising rice genotypes were evaluated for twelve physico-chemical, quality traits and yield. Analysis of variance for all the characters indicated significant difference among the genotypes. The values of phenotypic and genotypic coefficient of variation were high for water uptake and yield. Heritability was very low in volume expansion ratio. Hulling (%) ranged from 71.6% to 79.7%. Milling (%) ranged from 63.4 to 76.7% in all the genotypes. Head rice recovery percentage (HRR %) varied from 50.4% to 72.8%. Highest length breadth ratio was observed in long slender genotypes like NDR 9830144, NDR 9830118 and NDR 9830124. Elongation ratio varied from 1.5 to 1.9 and highest was observed in Salivahan. Volume expansion ratio in all the genotypes were less than 4.0 and highest was 3.9 (IR 53945-35- B-3-2CR-1). Amylose content was in intermediate rang (18.7 to 25.6%). Alkali spreading value ranged from 4.0 (OR 1898-2) to 7.0 (OR 1550–26). Yield varied from 1.1 t ha-1 (RAU 1314-3-3-3) to 3.3 t ha-1 (NDR 9830144). Among the tested genotypes NDR 9830144 and TTB 292–426 were having desirable quality characteristics and therefore these genotypes may be used in quality improvement programme.
Analysis of Macro and Micronutrients in Soils from Palestine Using Ion Exchange Membrane Technology
Ion Exchange membrane technology (IEM) is a method that allowed a single extraction process and a single subsequent measurement of different elements that are available in soil. The values of the available forms of the different macro- and micronutrients obtained by IEM extraction were compared with the values of the soluble form obtained by conventional extraction methods. In surface soil sample, the concentrations of available potassium, nitrate, phosphate, iron and boron were 37.7 mg kg–1, 17.5 mg kg–1, 3.6 mg kg–1, 171.0 μg kg–1, and 4.2 μg kg–1 respectively were greater than that of soluble forms of the same elements which were 7.0 mg kg–1, 9.2 mg kg–1, 0.4 mg kg–1, 109.0 μg kg–1, and 1.9 μg kg–1 respectively.