A study was conducted to determine how the nitrogen(N)in the fertilisers can be quantified and what amounts of fertilizers should be given to leafy vegetables to achieve their requirements.This study also aimed to det...A study was conducted to determine how the nitrogen(N)in the fertilisers can be quantified and what amounts of fertilizers should be given to leafy vegetables to achieve their requirements.This study also aimed to determine the efficient use of water by the plant.The experiment was laid out in a randomized complete block with three replicates and three levels of urea(T0=0 kg/ha,T1=43.5 kg/ha,T2=65 kg/ha).Estimation of growth parameters and biomass yield revealed that the treatments produced statistically identical values.But numerically,T1(43.5 kg of urea/ha)gave the highest yields and T2(65 kg of urea/ha)produced the lowest.It was the same for the determination of the water use efficiency(WUE)by the plant where T1 produced the highest values compared to T2.The yield curve as a function of the applied urea dose allowed the identification of the urea dose that corresponds to optimal yield in amaranth.From the dose of 65 kg of urea/ha,any increase becomes harmful to the plant.This results in a decrease in yield in the amaranth plant.展开更多
Africa’s fertilizer use averages only 8 kg per hectare per year. Available fertilizer recommenda-tions in Africa are high, and vary between countries. The recommendations are generally out dated, and/or “blanket” r...Africa’s fertilizer use averages only 8 kg per hectare per year. Available fertilizer recommenda-tions in Africa are high, and vary between countries. The recommendations are generally out dated, and/or “blanket” recommendations that are not site, or crop specific. Recommendation developed for one crop is often used for another and possibly unrelated crop. CABI and AGRA designed a project whose goal is “to help improve the capacity of National Research Institutions in developing fertilizer recommendations for efficient and profitable fertilizer use in 13 sub-Saharan African countries within the framework of ISFM practices under smallholder farming by the end of March 2016”. Baseline survey conducted in May 2014 targeted scientists, policy makers, extension workers, agro-dealers, fertilizer companies and farmers/farmer organization. Snowballing and convenience sampling techniques were used to get the sample and emails were used to reach the respondents. A total of 416 respondents were targeted but only 219 responded from 12 countries. Out of the 219, 148 were extension workers and researchers. About half (51%) of the scientists are aware of fertilizer optimization tool, and a lesser proportion have used the tool across all countries (31%). Fewer extension workers (31%) were aware of the fertilizer optimization tool and none reported to have used the tool. On average about 5% of the study participants reported that other stakeholders were involved in the development of fertilizer recommendations including farmers, farmer organizations, policy makers, researchers, extension workers, agro dealers, fertilizer companies and donor organizations. Stakeholder involvement was highest in Nigeria at 15%, followed by Ethiopia (13%) and Malawi (10%) but most of the countries reported <5%. There is a general understanding that development of fertilizer recommendations is a multi-stakeholder initiative and therefore need for involving many stakeholders in the development of fertilizer recommendations across Africa that will fosters greater ownership and sustainability.展开更多
基金The authors’ thanks go to the International AtomicEnergy Agency (IAEA) for funding the fellowshipand experiments. Their gratitude goes to the authorities of the National Centre for AgronomicResearch (CNRA) and the IAEA National LiaisonOfficers (NLO) of Côte d’Ivoire who made thisfellowship possible. Their thanks also go to theauthorities of Kenya Agricultural and LivestockResearch Organization (KALRO) and Irrigation andDrainage Management and Problem of Soil (IDMPS)Program for hosting the fellowship.
文摘A study was conducted to determine how the nitrogen(N)in the fertilisers can be quantified and what amounts of fertilizers should be given to leafy vegetables to achieve their requirements.This study also aimed to determine the efficient use of water by the plant.The experiment was laid out in a randomized complete block with three replicates and three levels of urea(T0=0 kg/ha,T1=43.5 kg/ha,T2=65 kg/ha).Estimation of growth parameters and biomass yield revealed that the treatments produced statistically identical values.But numerically,T1(43.5 kg of urea/ha)gave the highest yields and T2(65 kg of urea/ha)produced the lowest.It was the same for the determination of the water use efficiency(WUE)by the plant where T1 produced the highest values compared to T2.The yield curve as a function of the applied urea dose allowed the identification of the urea dose that corresponds to optimal yield in amaranth.From the dose of 65 kg of urea/ha,any increase becomes harmful to the plant.This results in a decrease in yield in the amaranth plant.
文摘Africa’s fertilizer use averages only 8 kg per hectare per year. Available fertilizer recommenda-tions in Africa are high, and vary between countries. The recommendations are generally out dated, and/or “blanket” recommendations that are not site, or crop specific. Recommendation developed for one crop is often used for another and possibly unrelated crop. CABI and AGRA designed a project whose goal is “to help improve the capacity of National Research Institutions in developing fertilizer recommendations for efficient and profitable fertilizer use in 13 sub-Saharan African countries within the framework of ISFM practices under smallholder farming by the end of March 2016”. Baseline survey conducted in May 2014 targeted scientists, policy makers, extension workers, agro-dealers, fertilizer companies and farmers/farmer organization. Snowballing and convenience sampling techniques were used to get the sample and emails were used to reach the respondents. A total of 416 respondents were targeted but only 219 responded from 12 countries. Out of the 219, 148 were extension workers and researchers. About half (51%) of the scientists are aware of fertilizer optimization tool, and a lesser proportion have used the tool across all countries (31%). Fewer extension workers (31%) were aware of the fertilizer optimization tool and none reported to have used the tool. On average about 5% of the study participants reported that other stakeholders were involved in the development of fertilizer recommendations including farmers, farmer organizations, policy makers, researchers, extension workers, agro dealers, fertilizer companies and donor organizations. Stakeholder involvement was highest in Nigeria at 15%, followed by Ethiopia (13%) and Malawi (10%) but most of the countries reported <5%. There is a general understanding that development of fertilizer recommendations is a multi-stakeholder initiative and therefore need for involving many stakeholders in the development of fertilizer recommendations across Africa that will fosters greater ownership and sustainability.
