Nitrophosphate as an alternative phosphate fertiliser for acidic sandy soils
type: CreativeWork
description: It is a common practice to use large quantities of reduced nitrogen (N) such as urea, ammonia (NH3) and ammonium (NH4+) as pre-plant (before planting) fertilisers in the Free State, Mpumalanga and North West where farmers apply monoammonium phosphate (MAP(33)) together with urea before planting. However, MAP(33) a source of phosphorous (P), which is pre-applied resulted in soil acidification, the accumulation of NH4+ and loss of cations. Nitrophosphate was therefore suggested as an alternative phosphate fertiliser to remedy low P use efficiency, soil acidity and to replace lost calcium (Ca) and magnesium (Mg). A study was conducted with the aim to compare nitrophosphate with MAP(33) when used as pre-plant fertilisers in acidic sandy soils commonly found in commercial agriculture. To meet this aim, two greenhouse experiments were conducted at the research facilities of Omnia (Pty) Ltd in Sasolburg, South Africa in 2013. The biomass, residual soil nutrient status and nutrient uptake of potted wheat plants were compared when fertilised with nitrophosphate and MAP(33). The experiments consisted of a completely randomised design (CRD) with two P fertiliser sources (nitrophosphate and MAP(33)), applied at four different rates (0, 15, 30 and 45 kg P ha-1) replicated five times. Urea was added to all treatments, except the controls, to ensure that all treatments received the same amount (106 kg N ha-1) of nitrogen (N). Micronutrients were supplied by topdressing with HIDROSPOOR at a rate of 2 kg ha-1. For the experiments wheat was planted in an acidic sandy soil (pHKCl of 4.1) collected from a commercial farm in Bothaville with a low Bray-1 P (15 mg kg-1), S (13 mg kg-1), ammonium acetate extractable Ca (79 mg kg-1) content and 5% clay. Results from the study indicated that the pH of soils treated with MAP(33) was higher than the pH of soils treated with nitrophosphate. The leaves of MAP(33) fertilised wheat had a consistently higher chlorophyll content than the leaves of n…
abstract: It is a common practice to use large quantities of reduced nitrogen (N) such as urea, ammonia (NH3) and ammonium (NH4+) as pre-plant (before planting) fertilisers in the Free State, Mpumalanga and North West where farmers apply monoammonium phosphate (MAP(33)) together with urea before planting. However, MAP(33) a source of phosphorous (P), which is pre-applied resulted in soil acidification, the accumulation of NH4+ and loss of cations. Nitrophosphate was therefore suggested as an alternative phosphate fertiliser to remedy low P use efficiency, soil acidity and to replace lost calcium (Ca) and magnesium (Mg). A study was conducted with the aim to compare nitrophosphate with MAP(33) when used as pre-plant fertilisers in acidic sandy soils commonly found in commercial agriculture. To meet this aim, two greenhouse experiments were conducted at the research facilities of Omnia (Pty) Ltd in Sasolburg, South Africa in 2013. The biomass, residual soil nutrient status and nutrient uptake of potted wheat plants were compared when fertilised with nitrophosphate and MAP(33). The experiments consisted of a completely randomised design (CRD) with two P fertiliser sources (nitrophosphate and MAP(33)), applied at four different rates (0, 15, 30 and 45 kg P ha-1) replicated five times. Urea was added to all treatments, except the controls, to ensure that all treatments received the same amount (106 kg N ha-1) of nitrogen (N). Micronutrients were supplied by topdressing with HIDROSPOOR at a rate of 2 kg ha-1. For the experiments wheat was planted in an acidic sandy soil (pHKCl of 4.1) collected from a commercial farm in Bothaville with a low Bray-1 P (15 mg kg-1), S (13 mg kg-1), ammonium acetate extractable Ca (79 mg kg-1) content and 5% clay. Results from the study indicated that the pH of soils treated with MAP(33) was higher than the pH of soils treated with nitrophosphate. The leaves of MAP(33) fertilised wheat had a consistently higher chlorophyll content than the leaves of n…
language: en
keywords: UCTD
date published: 2016
date modified: 2026-07-24T03:52:45Z
provider: University of Pretoria
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Pretoria

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2263/57262