30/06/2024
Regulating the soil pH in farming
For a very long time we have struggled with low productivity in small scale farming. We have barely improved from 0.8MT to 2.2MT for 30 years since 1995. This is not a good feat in a country with very good soils and relatively good climate. This can be attributed to many factors including agronomic as well as some policies we have implemented in the past.
For a very long time, many thought it was inefficient use of inputs like Fertilisers and seed, but it goes beyond these. One of the factors that has greatly affected our agriculture is not to regulate a favorable soil pH. Of recent, we have discovered some hidden constraints such as nematode infestation in our soils, soil pests and diseases. Soil pH is a big factor and will be amplified as we endeavour to continue with our green revolution strides.
Our farmers have tried against all odds to produce even where the soil pH is very low (acidic). For instance, in the northern parts of the country where we receive rains as high as 1200mm in four months, soils are predominantly acidic. Our parents tried to regulate this by practicing a farming system called chitemene. They would chop off branches of trees and burn down. They would cultivate that particular land for two seasons before moving to a new areas. This was so possible then when our population was low; now that the population is increasing and the country is becoming more industrialized, People are farming on permanent land forever, therefore, they are not able to practice this system any longer.
To counter this problem of soil acidity, farmers need to remedy their land by applying lime. With farmers that have limited choices to make, their first choice of input procurement would be fertiliser, seed, and pesticides in that order. Therefore, l foresee soil acidity problems becoming more and more pronounced as we become more greener. Policy formulators should not forget about soil acidity as they continue to strive to make agriculture the number one sector. I can assure you that if not recitified, some farmers will start abandoning their fields. Watch out for a paragraph or so in my forthcoming coming book on soil acidity. The title of the book will be ‘Whispers in Eden, rediscovering the promised paradise’. It will hit the shelves sometime in 2025. Bye for now and responsibly enjoy the long weekend in Zambia. Don’t make that mistake.