Effect of NPK in the management of Alternaria black spot disease severity, seed yield and oil content of mustard

Abstract

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.