Studies on combination of different forms of potassium and micronutrients on fruit yield and post-harvest quality of guava (Psidium guajava L.)

An investigation was carried out to find out combination of different forms of potassium and micronutrients on fruit yield and post-harvest quality of guava (Psidium guajava L.) was carried out at the Department of Horticulture, College of Agriculture Parbhani during the year 2019-20.The field experiment was laid out in Randomized Block Design with thirteen treatments and three replications.The treatments were: T1-KH2PO4 at 1% + FeSO4 at 0.5%, T2-KH2PO4 at 1.5% + FeSO4 at 0.5%, T3 -KH2PO4 at 1% + ZnSO4 at 0.5%, T4 -KH2PO4 at 1.5% + ZnSO4 at 0.5%, T5 -K2SO4 at 1% + FeSO4 at 0.5%, T6 -K2SO4 at 1.5% at + FeSO4 at 0.5%, T7-K2SO4 at 1% + ZnSO4 at 0.5%, T8-K2SO4 at 1.5% + ZnSO4 at 0.5%,T9-KNO3 at 1% +FeSO4 at 0.5%,T10-KNO3 at 1.5% + FeSO4 at 0.5%,T11-KNO3 at 1% + ZnSO4 at 0.5%,T12-KNO3 at 1.5% + ZnSO4 at 0.5% and T13-control through foliar application which was sprayed two times after fruit set at 15 days interval.Results of the study indicated that maximum number of fruits per tree (160.33),fruit retention (80.60 %), yield per tree (39.4 kg), yield per hectare (10.95 Mt per ha) and minimum fruit drop (19.84 %), maximum fruit weight (246.3 g), fruit volume (220.6 ml), fruit length (7.86 cm) and fruit diameter (8.06 cm) were more in treatment T12 i.e., KNO3 at 1.5% + ZnSO4 at 0.5%.Better fruit quality and more shelf life (8.4days) and minimum physiological loss in weight (11.77 %), fruit decay (24.7 %) during at ambient storage was also recorded under above treatment.