The redistribution of soil water after the cessation of infiltration in three agricultural soils was analyzed experimentally in the laboratory. It was found that the rate of redistribution within the soil profiles depended upon the initial depth of wetting and the soil water content‐soil water pressure‐capillary conductivity relations. The results are discussed in relation to measured and predicted profiles of inert porous mediums. (Key words: Infiltration;irrigation; soft water)
Phosphate availability is a major factor limiting tillering, grain filling vis-á-vis productivity of rice. Rice is often cultivated in soil like red and lateritic or acid, with low soluble phosphate content. To identify the best genotype suitable for these types of soils, P acquisition efficiency was estimated from 108 genotypes. Gobindabhog, Tulaipanji, Radhunipagal and Raghusail accumulated almost equal amounts of phosphate even when they were grown on P-sufficient soil. Here, we have reported the presence as well as the expression of a previously characterized rice gene, phosphate starvation tolerance locus (PSTOL1) in a set of selected genotypes. Two of four genotypes did not show any detectable expression but carried the gene. One mega cultivar, Swarna did not possess this gene but showed high P-deficiency tolerance ability. Increase of root biomass, not length, in P-limiting situations might be considered as one of the selecting criteria at the seedling stage. Neither the presence of PSTOL1 gene nor its closely-linked SSR RM1261, showed any association with P-deficiency tolerance among the 108 genotypes. Not only this, but the presence of PSTOL1 in recombinant inbred line (RIL) developed from a cross between Gobindabhog and Satabdi, also did not show any linkage with P-deficiency tolerance ability. Thus, before considering PSTOL1 gene in MAB, its expression and role in P-deficiency tolerance in the donor parent must be ascertained.
Present study was designed to assess the prospect of fresh phosphate solubilizing bacterial isolates (PSB), to ones, used as PSB-biofertilizer in growth promotion of groundnut (Arachis hypogaea L.). Phosphate-solublizing index (PSI) of 17 isolates varied from 1.692 to 3.033, after seven days incubation. Tricalcium phosphate solubilization by PSB ranged from 309.72 to 615.28 ìg/ml and highest value was recorded for isolate JCA-5. Three most efficient fresh isolates were clustered under the genera Burkholderia, Bacillus and Brevibacillus. The supplementation of elite PSB isolates augmented growth and P-uptake irrespective of edaphic conditions for groundnut. Steady increments in root (22.6% and 25.5%) and shoot length (27.6% and 33.7%), root dry-weight (20.3% and 16.2%),shoot dry-weight (11.3% and 23.3%) and P-uptake (30% and 67%) of groundnut was evident in red-laterite soil and new alluvial soils respectively in comparison to the previously acknowledged PSB biofertilizers.
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