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BookletCorporate general interestStandard operating procedure for soil available phosphorus - Bray I and Bray II method 2021
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No results found.P-Bray 1 and P-Bray 2 methods are normally limited to acid soils with water pH values less than 6.8. The P-Bray 1 Method removes a fraction of the “adsorbed” phosphorus (Al-P, Fe-P, Mn-P and Ca-P but less efficient) while the P-Bray 2 Method is best suited to acid soils where rock phosphate has been the primary P fertilizer source and/or the major portion of P exists in the soil in various forms of calcium phosphate. Bray extractants should not be used on alkaline soils because the acid tends to be neutralized and/or excessive calcium phosphates may be extracted, giving a false high test for available P. -
BookletCorporate general interestStandard operating procedure for soil nitrogen - Kjeldahl method 2021
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No results found.This standard operating procedure (SOP) describes, in general terms, the quantification of the Kjeldahl nitrogen(KjN) content in soil samples. The advantages of this method are based on its robustness, low initial cost of the equipment and extensive application. However, there are disadvantages in using this method compared to others, for example, the use of potentially hazardous reagents that require consideration for safe operation are utilized, alongside the generation of hazardous waste and on-going cost of consumables, which can be mitigated via modified protocols that use lower quantities of reagents. Another limitation of this method is that it measures organic N and mineral N in the form of ammonium cation (NH4+), therefore, to measure the total N, the mineral N in the form of NO3- must be measured separately -
BookletCorporate general interestPost-harvest management of banana for quality and safety assurance
Guidance for horticultural supply chain stakeholders
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No results found.This guidance note presents the results and lessons learned from an FAO Technical Cooperation Project for capacity development to reduce post-harvest losses in horticultural chains in Timor-Leste. Technical improvements were piloted in Timor-Leste with stakeholders in traditional banana supply chains.