1-10years Plan on Manuring and Fertilization programme of Avocado Trees
AVOCADO TREES: Kindly facilitate me with a proper fertilisation and manuring programme for 1-10 years or more, plus any locally available substitutes where possible and the best times of the year to apply them. ~~ Chris Munene Charagu
Manuring and fertilisation: To obtain maximum growth and optimum yields, it is important to supply the avocado trees with necessary nutrients.
It is, however, dangerous to give excessive amounts on any size of trees at one time as it may cause root damage, leaf burn and defoliation.
The type of fertiliser to be used depends on soil pH. In the planting year, it is advisable not to top-dress the orchard since this may retard root development during the first 4-5 months after planting.
After this period, 60g of 26 per cent N fertiliser should be applied after every three months when the soil is moist. In addition, about 25kg of well-rotten manure should be spread around the trees after each year.
The following are recommendations for N, P fertilisers to be applied each year (CAN and SSP):
1st year after planting 60g CAN + 250g SSP
2nd year 85g CAN + 500g SSP
3rd year 500g CAN + 750g SSP
4th year 750g CAN + 750g SSP
5th year 1kg CAN + 750g SSP
6th year 2kg CAN + 1kg SSP
7th year 3kg CAN + 1.5kg SSP
8th year 4kg CAN + 2kg SSP
9th year 5kg CAN + 2.5kg SSP
10th year 6kg CAN + 3kg SSP
CAN will supply calcium and nitrogen, SSP will supply calcium, phosphorous and sulphur.
The use of farmyard manure is particularly strongly recommended because it improves the physical condition of the soil and promotes the adsorption in the soil and uptake by the plant of micro-nutrients.
The above listed N levels should also be applied in splits. Avocado trees also have a very high requirement for potassium, magnesium and zinc.
Measures should, therefore, be taken to supplement these when they fall short.
Department of Crops, Horticulture and Soils, Egerton University.
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