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Title: The effect of pelletised and powdered lime on soil Ph, crop yield and crop quality on Richards Bay KZN soil
Authors: Naidoo, Veloshni 
Keywords: Food security;Soil acidity;Soil pH stabilisation
Issue Date: Nov-2019
In the 20th century, food security was constrained due to the increase in population
and the pressure it placed on food demand. By 2050 further strain is going to be
placed on food security as the population is anticipated to double. Land and natural
resources are scarce, and soil acidity is a major concern in most parts of the world. A
solution to treat acidic soil to increase its fertility to obtain better crop yields and
quality is the treatment of lime together with gypsum. Lime is found in two forms
pelletised and powdered; however, there lacks practical evidence to support; which
is the best form to obtain optimised crop yields and crop quality. Therefore this study
was conducted to determine the effect of each lime form together with gypsum on
soil pH stabilisation, crop yield and crop quality on a peanut harvest. A quantitative
research paradigm and an experimental research strategy were adopted. The pilot
study found that the dosage range for pelletised lime being 3 tons/hectare plus
20%vol/lime gypsum and powdered lime was 5 tons/hectare plus 20%vol/lime
gypsum. These dosage rates resulted in optimised crop yield and crop quality of
peanuts. To ascertain the effects of elevated dosage rates the main study found the
effect of both powdered and pelletised lime at two times and three times the
optimised dosage range on soil pH stabilisation, crop yield and crop quality.
Experimental error was minimised with the use of replicate samples, and a control
(the untreated soil) was used as a reference.
The optimum dosage range of pelletised lime resulted in a higher crop yield, and
100% of the crop met the quality standard as all peanuts yielded filled the shell
cavity. However, the optimum dosage range for powdered lime resulted in a lower
crop yield Furthermore, only 65% of the crop met the quality standard. It was found
that less pelletised lime is required to stabilise soil pH than powdered lime over a
period. Soil treated with pelletised lime had an increased crop yield and quality of
peanuts over the use of powdered lime.
Despite the above findings, it was evident that overtreatment of both pelletised and
powdered lime alone and together with gypsum did not result in a better crop yield or
quality. The overtreatment of either pelletised lime or powdered lime and gypsum
showed a decrease in crop yield and quality once the optimised dose was exceeded. Consequently the overtreatment of either lime form or gypsum possibly had a toxic
effect and inhibited crop yield and crop quality.
Submitted in fulfillment of the requirements of the
Degree of Master of Philosophy in Management Sciences in Quality and Operations Management, Durban
University of Technology, Durban, South Africa, 2019.
Appears in Collections:Theses and dissertations (Management Sciences)

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