An experiment was conducted to evaluate the effect of NPK against the management of Alternaria black spot disease, productivity and oil content of mustard during 2015-16 and 2016-17 in the rabi seasons in the Krishi Vigyan Kendra, Katni (MP) with three doses of nitrogen, potassium and constant phosphorus. In the year 2015-16, each increased dose of nitrogen, there was a significantly increase in percent disease incidence on leaf from 26.66% to 47.41% and zero level of nitrogen shown less disease incidence (33.44% to 35.39%).Minimum incidence of disease (19.33%) in the year 2015-16 was recorded in the treatment applied 120kg nitrogen and 60kg potash. Increased dose of potash from 60kg to 80kg/ha with 120kg nitrogen increased the disease incidence (19.33% to 29%). Overall disease incidence on leaf increased with increase the nitrogen dose from 120kg to 160kg/ha with 80kg/ha potash. Highest disease incidence (47.41) was recorded in treatment given160kg N and 40kg K. Same trend of disease incidence on leaf was found in the year 2016-17. The highest seed yield (20.66q/ha)was achieved in 120kg N 60kg K along with 40kg P (Constant) applied plot followed by 140kg N and 60kg K (17.96q/ha and 120kg N plus 40kg K in the year 2015-16.There were no differences in seed yield among the treatment 1, treatment 3,treatment 4and treatment 6. Minimum seed yield (10.33q/ha) was obtained in control plot. In the year 2016-17, maximum yield (18.91q/ha) was recorded in plants receiving the 120kg N and 60kg K which was significantly higher than all the treatment plots. There was increased in yield with increase in K level from 40kg to 60kg/ha. Oil content was significantly decrease when plant were raised under higher doses of N and K. Significantly more oil percent (40.13%) was recorded in treatment applied 120kg N and 60 kg K followed by 120kg N and 40kg K (39.35) in comparison to control plot. Same trend of the oil recovery was also recorded in the year 2016-17.
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