Rural Household Labour Demand, Contract Choice, Hoarding Cost and Poverty: Evidence from Western Kenya

This study determines the factors that influenced contract choice, labour demand and examines the existence of labour hoarding practice in Western region of Kenya. Data from Egerton University’s Tegemeo Institute of Agricultural Policy and Development was used for the analysis.. A two step Heckman model was employed to estimate the extent of engagement in daily and semi-permanent contracts conditional on choice of contract. Results from the study show that casual and semi-permanent contracts are substitutes. Family labour negatively influences engagement in daily and semi-permanent contracts hence it is a substitute to the two forms of the contracts. Increase in wages paid to casual contracts is negative and significant to the extent of daily contract engagement but positive and significant to semi-permanent contracts supporting the substitutability of daily contracts for semi-permanent contracts. Methods and costs of farm preparation are significant in influencing the choice and demand for any type of contracts. The proxy variable for hoarding costs is significant and positive indicating that there are hoarding costs incurred in the maintaining a steady pool of labour within the farm. From the results the relatively asset poor farmers engage in the wage high daily contracts to avoid incurring hoarding costs as indicated by the dummy denoting poverty level. However, to avoid uncertainty during peak periods semi-permanent contracts are highly employed by the asset poor farmers. From the results, farmers willing to minimize hoarding costs may find themselves substituting family labour for daily contracts or in absence of family labour, semi-permanent contracts for daily contracts.Contracts, Kenya, Labour, Policy, Agricultural and Food Policy, Consumer/Household Economics, Environmental Economics and Policy, Farm Management, Food Consumption/Nutrition/Food Safety, Food Security and Poverty, Institutional and Behavioral Economics, Labor and Human Capital, Land Economics/Use, Productivity Analysis, Research and Development/Tech Change/Emerging Technologies,

Resilience of Organic versus Conventional Farming Systems in Tropical Africa: The Kenyan Experience

In Kenya, agriculture is largely carried out by smallholder farmers, in a mixed farming noncommercialised setting where application of synthetic fertilisers and pesticides is minimal. Agricultural production is low and constrained by declining soil fertility, pest and diseases and increasingly unpredictable weather due to global warming. This calls for more resilient farming systems

Site-specific organic and conventional crop yields in a long-term farming systems comparison in sub-humid central Kenya

Organic farming is increasingly being taken up by farmers and agricultural development agencies in tropics. This is in a bid to improve world food security and rural livelihoods in a sustainable way. Long-term field trial that compares organic and conventional systems was set up in sub-humid central Kenya since 2006 to provide a scientific basis for organic agriculture in the region. The project seeks to gather data on how organic farming affects: yield and yield stability; stability of the agro-ecological system; and natural and economic resource efficiency. The experiments were set up at two sites namely Chuka and Thika. Both sites are at an altitude of 1500m asl. While Chuka lies in a high potential area with 2000 mm of rainfall and good soil phosphorus availability, Thika has fair yield potential, 1000 mm rainfall and low phosphorus availability. Crop rotations include maize, beans and vegetables.” The trials compares organic and conventional systems at two input levels, namely subsistence and commercial levels, resulting in four treatments: Conventional high input, organic high input, conventional low input and organic low input. In Chuka, organic yields were on average the same as conventional yields. On the low potential site of Thika, organic yields reached an average 55% of the conventional yields. Organic yields on the low input level were on average 13% lower than conventional yields on the low input level. On the high input level, organic yields were on average 26% lower than conventional yields. Organic maize yields achieved on average 77% of conventional maize yields, whereas organic brassica yields were 66% lower than conventional brassica yields. No significant difference was observed between mean organic and conventional legume crop yields. Our results suggest that: on high potential site of Chuka, organic crops can be grown without yield reduction; on low potential site of Thika, especially if low nutrient availability coincide with low rainfall, considerable yield reductions must be expected in organic systems in the transition phase; low input systems are less sensitive to conversion to organic agriculture than high input systems and relative yield levels in organic systems vary between crops

First season maize performance in a long-term farming systems comparison trial at KARI-Thika, Kenya

Kenya’s smallholder farmers contribute 65% to total agricultural output in a predominantly mixed farming system where application of inorganic fertilizers and pesticides is minimal. By contrast, agriculture in developed temperate countries is dominated by large-scale farming and heavy reliance on fertilizers and pesticides to sustain high yields. Research conducted in temperate developed countries has shown that organic farming is superior to conventional farming in resource use efficiency, ecosystem functioning, soil fertility conservation and economic performance but results cannot be transferred directly to the tropics because of disparities in climate, soils and socio-economic environments. A long-term farming systems comparisons experiment was initiated at KARI-Thika in 2006 to assess the contribution of organic agriculture to food security, poverty alleviation and environmental conservation. Four treatments (Conventional High, Conventional Low, Organic High and Organic Low) were imposed in 8m x 8m plots using a randomized complete block design and replicated five times. The ‘High’ treatments received 118 kgN/ha and 66+5kgP/ha while the ‘Low’ treatments received 65 kgN/ha and 27 kgP/ha. Conventional treatments received the nutrients from farmyard manure, diammonium phosphate and calcium ammonium phosphate while compost, Tithonia diversifolia, and phosphate rock were applied in the organic treatments. Maize variety Pannar was planted at the onset of rains in April 2007 and harvested in August from a net plot area of 6m x 6m. The plots were hand weeded while stock borer was controlled using a Neem extract and ash/soil mixture in organic treatments and Bulldock® in conventional treatments. Stover dry weights were significantly higher in Conventional High than Organic Low (P=0.034) and indistinguishable from those observed in Conventional Low and Organic High. It was reasoned that availability of applied nutrients and the low poorly distributed rainfall received during the flowering and grain filling stages impacted negatively on grain yield

In-situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

In this study, high phase purity of zeolite A was prepared from coal fly ash precursors. The molar regime of both the clear solution extract and unseparated fly ash slurry was adjusted to achieve the right composition for zeolite A crystallization. The formation process for zeolite A from coal fly ash precursors was monitored in detail using an in situ ultrasonic system and was complemented by use of ex situ techniques such as XRD, FTIR, SEM and FTIR. The findings from both the in situ ultrasonic monitoring process and ex situ techniques clearly contributed significantly in unmasking the formation process of zeolite A from coal fly ash compared to previous studies reported in the literature. The study also enriches the existing body of literature by deeply investigating the gel–solution–crystal interactions starting from this complex feedstock. Comparable ultrasonic signals were generated when both clear and unseparated fly ash based precursor solutions were used during the zeolite synthesis process.Web of Scienc

Tilting chains of negative curves on rational surfaces

We introduce the notion of exact tilting objects, which are partial tilting objects $T$ inducing an equivalence between the abelian category generated by $T$ and the category of modules over the endomorphism algebra of $T$. Given a chain of sufficiently negative rational curves on a rational surface, we construct an exceptional sequence whose universal extension is an exact tilting object. For a chain of (-2)-curves, we obtain an equivalence with modules over a well known algebra.Comment: 13 page

Long-term performance of organic crop rotations in the tropics: First results from a high and a medium potential site in sub-humid Central Kenya

Organic Agriculture is perceived by many stakeholders as a promising approach to increase food security in developing countries. However, only few attempts have been made so far to assess agronomic and economic performance of Organic Agriculture in these regions in a systematic way. The Research Institute of Organic Agriculture (FiBL), together with its partners, is presently establishing long-term comparisons of farming systems in various agro-ecological and socio-economic contexts to study the different parameters that are essential for sustainable development. To date, three study areas have been selected: (a) a sub-humid area in Kenya where farming is subsistence-oriented; (b) a semi-arid area in India where cotton is produced for the export market; and (c) a humid area in Bolivia where cacao and other perennial products are produced for the export and domestic markets. The key elements are replicated long-term field trials. These are complemented by farm surveys and short-term trials under on-farm conditions. This network of comparison of farming systems in the tropics is expected to (1) put the discussion on the benefits and drawbacks of Organic Agriculture on a rational basis; (2) help to identify challenges for Organic Agriculture that can then be addressed systematically; (3) provide physical reference points for stakeholders in agricultural research and development and thus support agricultural policy dialogue at different levels. In Kenya, the two trials sites are located in a high potential zone in Meru South District (Chuka) and in a medium potential zone in Maragua District (Thika). They consist of four treatments: conventional and organic, each at a low and a high input level, representing subsistence oriented and commercial farming, respectively. Maize, brassicas and maize were planted during the first, second and third season respectively in both organic and conventional plots. In the first three seasons, we found the following results: in Chuka, organic yields of the low input treatments were on average 4% lower than conventional yields. On the high input level, organic yields were 6% lower. In Thika, organic yields were on average 57% (low input level) and 33% (high input level) lower than conventional yields. It is assumed that the organic crops in Chuka could benefit from N and P mobilisation from the soil. In Thika, where N and P were probably less available, the crop depended on the easily soluble nutrients applied in the conventional treatments. The effect of lower nutrient availability in the organic treatments in Thika was possibly aggravated by serious drought spells during the second and third season. The questions of interest are a) whether the organic treatments can keep the yield level of the conventional treatments in Chuka or if they will go through a depression typical for conversion from conventional to Organic Agriculture; and b) if the organic treatments can improve soil fertility and thus the organic yield levels in Thika in the coming years

Synthesis of zeolites from coal fly ash using mine waters

In this study mine waters obtained from coal mining operations in South Africa were used as a substitute for pure water during the synthesis of zeolites from South African coal fly ash. Procedures that had been optimized to produce single phase zeolite Na-P1 and X using pure water were employed independently. The use of circumneutral mine water resulted in similar quality zeolite Na-P1 and X whereas the use of acidic mine drainage led to the formation of a single phase hydroxysodalite zeolite. Since these two wastes (fly ash and mine waters) are found in close proximity to each other, this study demonstrates that they can be used to ameliorate each other and at the same time produce saleable zeolitic products that can be used to offset their costs of disposal and treatment.Web of Scienc