There are three main approaches to tackle micro-nutrient disorders in potato.
First approach consists of the application of a micro-nutrient carrier to the soil where large quantity of a fertilizer has to be applied to compensate the high fixation capacity or quick reversion of the nutrient elements to unavailable forms. However, its effect lasts for a few years depending upon the type of the soil and cropping system.
Second approach consists of foliar application of micro-nutrients to each crop while the third approach is of treating mother seed tubers, with micro-nutrient compounds. Foliar spray during dry spell should be avoided between 11 a.m. and 3 p.m. to prevent scorching of leaves. The optimum dose of different micro-nutrients are as below
Doses of micronutrient
application for correction of their deficiency in potato
Micro-nutrient |
Soil
application (kg/ha) |
Spray
application (g/100
lit. water) |
Tuber
soaking treatment (g/100 lit. water) |
Zinc
sulphate |
25 |
200 |
50 |
Ferrous
sulphate |
50 |
300 |
75 |
Manganese
sulphate |
25 |
200 |
50 |
Copper
sulphate |
25 |
200 |
50 |
Ammonium
molybdate |
2 |
100 |
20 |
Sodium
borate |
2 |
100 |
20 |