ABSTRACT

The experiment was conducted at Agriculture Research Station, BARI, Bogura during 2019-20 and 2020-21 regarding management of tip burn, a leaf blight disease of garlic. Tip burn is a common phenomenon in garlic plants. The study comprised 10 treatments i.e., T1= Five irrigation at an interval of 15 days starting after emergence, T2= Soil amendment with ash 2.0 tha-1, T3= Soil amendment with boron @ 2 kgha-1, T4= Five times foliar spraying with boric acid @ 3 gL-1 at an interval of 15 days starting after emergence at 3-4 leaf stage, T5= Soil amendment with Zn @ 3 kgha-1, T6= Foliar spray of Potassium sulphate (K2SO4) @ 5 gL-1 twice at fortnightly interval at 3-4 leaf stage, T7= Foliar spray of Calcium sulphate (CaSO4) @ 5 gL-1 twice at fortnightly interval at 3-4 leaf stage, T8= Amister top @ 1 mlL-1 of water, T9= Nutraphos-N 3 times foliar spraying @ 4 gL-1 at an interval of 15 days starting at 3-4 leaf stage and T10 = Control were employed in the experiment. The tip burn incidence varied with the different management approaches ranging from 75.32 -90.54% in 2019-20 and 85.15-97.38% in 2020-21 cropping season. The application of ash, soil amendment with Zn, timely irrigation schedule, application of K2SO4 and CaSO4, spraying with fungicide like Amister top and Nutraphos-N3 were seemingly helpful for slightly reduction in burning of the tips of garlic plants as compared to no spray (control) condition. However, the highest tip burn incidence was obtained from T10 (Control) treatment and the lowest incidence was obtained from T8 (Amistar Top @ 1 mlL-1 of water) and T9 (Nutraphos-N 3 times foliar spraying @ 4 gL-1). Boron application either in soil or by spray as Solubor has no effect on reducing burning incidence. More burning resulted in reduction of bulb yield of garlic and vice versa. Yield varied from 7.77-10.42 t/ha in 2019-20 and from 6.72-7.53 t/ha in 2020-21. The highest yield was recorded in T9 and T8 which are statistically identical to the yield secured from other treatments except T10 (control). Higher bulb yield contributed to the higher gross return and gross margin. Maximum gross return and gross margin was recorded from T9 treatment followed by T8 and the minimum from T10 treatment.

Key words: Tip burn, Nutrient management, garlic.

Introduction

Garlic (Allium sativum L) is one of the most important bulb crops commercially grown in all parts of the country. It is an indispensable component in our daily life, mostly in the kitchen. It has medicinal value also. The total production area was 60776 ha and the total production was 381851 metric tons with an average yield of 6.28 metric tons per hectare in Bangladesh (BBS, 2018). The average yield of garlic in our country is very low compared to other garlic growing countries in the world. This is due to various disease-insect especially tip burn (physiological disorder) and lack of developed production technology (Bisht et al., 1993, Dordas, 2009  and  Mishra et al., 2009). But very little effort was given for the management of tip burn in Bangladesh. Researchers of different parts of the world reported that water shortage, potassium scarcity and micronutrient limitation may cause tip burn in garlic (Dordas, 2009 and Mishra et al., 2009). It may also cause by primary or secondary infection of fungus (Oboron et al., 2003). Considering the above fact, the present study was undertaken to find out the effective control measures of tip burn for increasing the garlic production of Bangladesh.