The present investigation was carried out during kharif 2012 at the Agricultural Research Station, Gulbarga and other four locations located in north eastern dry zone (Zone 2) of Karnataka, to know the stability of the nineteen advanced genotypes of pigeonpea. Highly significant differences among genotypes were observed for all the characters except number of pods per plant, number of seeds per pod and seed yield per plant. The variance due to Genotype x Environment found significant for the characters like days to 80% pod maturity and number of seeds per pod. Environment (linear) interaction component was significant for all the traits. The variance due to pooled deviation (non-linear) was highly significant for all the characters except for number of seeds per pod which reflect considerable genetic diversity in the material. Out of 19 genotypes studied two entries viz., GRG-109 and GRG-107 were consistent and high yielding compared to local checks.
SummaryRetention and movement of water was better in conservational agricultural systems as compared to conventional agricultural system. Statistical tool Tukey test suggested that conservational agricultural systems that too raised bed with retention of crop residue at soil surface recorded statistically significant available water, water held at field capacity and permanent wilting point over that of conventional agricultural system and however, another statistical tool Pearson correlation indicated that neither tillage, crop residue retention at surface nor raised bed influenced water retention characteristics of soil such as MWHC, AW, water at FC and PWP which were significantly correlated with particle size class rather than organic carbon the resultant product of management factors. Other hydrological properties of soil such as infiltration rate, water storage capacity as well as hydraulic conductivity were better in conservational agricultural systems than in conventional agricultural system and however, infiltration rate and hydraulic conductivity were significantly superior in no tilled soil with raised bed and crop residue retained at soil surface.
A field experiment was carried out at Agricultural Research Station, Gangavathi, Karnataka during 2012-13 to 2014-15 A comparison of Laser guided leveler technology with zero tillage along with crop residue treatment and Farmers practice were carried out and it was found that Significantly higher yield and straw was recorded in the former practice (2450 and 2756 kg ha -1 ) as compared to later (1850 and 1950 kg ha -1 ). Similarly, number of plants per sq. meter area and plant height was significantly higher in laser leveling with zero tillage and 100% previous crop residue retained treatment and lowest in normal leveled land in farmers practice. Among eight treatment, the quantum of irrigation water applied was less in case of laser leveling with zero tillage with 100% previous crop residue retained treatment followed by laser leveling with zero tillage with 50% previous crop residue retained treatment and was more in case of farmers practice (control). The total water saving was to the extent of 27% in case of laser leveling with zero tillage with 100% crop residue retained treatment over control treatment. After harvest, the pH and ECe of the blocks varied between 7.9-8.66 and 4.04-9.04 dS/m at 0-15 cm and 7. 87-8.68 and 3.76-8.25 dS/m at 15-30 cm depths respectively. After harvest of third year crop, slightly higher soil organic carbon content was recorded at surface depth (0-15 cm) in T 7 treatment as compared to before sowing. It was concluded that, higher yield of wheat and water saving can be achieved in laser leveled land by using 100% previous crop residue retained in zero till land under saline soils.
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