Annona Species Monograph.pdf - Crops for the Future

Chapter 10. Agronomy
values. This suggests that N application at or above 4.14 kg per cherimoya
tree impairs the storage quality and organoleptic properties of the fruits.
Annona fruits have a high demand for potassium, and to avoid serious
symptoms of potassium deficiency (especially those related to fruit
production and quality), potassium content in leaves should be maintained
above the suggested critical level of 1.0% (Torres and Sánchez, 1992; Silva
and Silva, 1997). Torres and Sánchez (1992) recommended a guide for
nitrogen, phosphorus and potassium (Tables 10-8, 10-9 and 10-10) for adult
soursop trees based on the age and the nutrient content of the soil in
Colombia, for orchard fertilization.
Table 10-8. A guide for nitrogen fertilization (g of N/tree/year) for adult
soursop trees in different regions of Colombia, according to age and
nutrient content in the soil
Region
Intermediary Valley
Atlantic Coast and
Oriental Plains
Organic Matter
Tree Age
(%) 3 years old 3-6 years old 6 years old
3 45-70 80-110 110-135
3-5 30-45 50-80 80-110
3 50-80 90-120 120-140
3-5 30-50 60-90 90-120
5 20-30 30-60 60-90
Source: Torres and Sánchez (1992).
Table 10-9. A guide for phosphorus fertilization (g of P 2
0 5
/tree/year) for
adult soursop trees in different regions of Colombia, according to age
and nutrient content (ppm) in the soil
Region
Inter Andean Valley
Atlantic Coast and
Oriental Plains
P ppm
Tree Age
3 years old 3-6 years old 6 years old
20 45-60 60-110 180-240
20-40 20-45 30-60 120-180
40 0-20 0-30 60-120
15 60-80 75-130 140-360
15-30 30-60 45-75 180-240
30 0-30 0-45 90-180
Source: Torres and Sánchez (1992).
Table 10-10. A guide for potassium fertilization (g of K 2
O/tree/year) of
adult soursop trees in Colombia, according to tree age and potassium
(meq/100 g of soil) content in the soil
Content of Potassium
Tree Age
(meq/100 g of soil) 3 years old 3-6 years old 6 years old
0.20 40-60 60-90 90-130
0.20-0.40 20-40 40-60 60-90
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