This study was planned to investigate the effect of different inoculum levels (10 3 spores/ml, 5x10 3 spores/ml, 10 4 spores/ml and 5x10 4 spores/ml) of Ascochyta fabae f. sp. lenntis on plant growth and yield parameters on four different varieties of lentil belonging to resistant and susceptible group, grown in Department of Plant Pathology University of Agriculture Faisalabad. All the varieties showed varying response towards different inoculum levels of Ascochyta blight. It was found that with the increase in the inoculum levels there was decrease in plant height, number of leaflets, pods/plant, grains/pod and 100 grain weight and this response was noticed higher in susceptible group as compared to resistant group.
In a field trial (2012), simulated aerosols: NH4Cl (reduced) and NaNO2 (oxidised) @ 10 & 20 kg ha-1y-1 (˜ 100 ppm & ˜ 200 ppm respectively), 1000 cm3m-2 of each along with a control were misted to population of Kufri Jyoti at different growth stages viz., vegetative (10-60 DAS), tuber initiation (60-90 DAS) and tuber bulking >90DAS). The higher dose of aerosols lowered nitrate reductase activity, nitrogen use efficiency, cell membrane stability, tuber yield, but increased photosynthesis, peroxidise activity significantly. The mechanisms of injury in terms of higher peroxidase activity and lower membrane stability of leaf cells have been elucidated. Foliar feeding of nitrogenous pollutant in the form of aerosols to plants at juvenile stage is important in addition to basal use of recommended fertilizers.
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