scholarly journals Agronomic and economic evaluation of phosphate fertilizer use in maize-bean cropping systems in Western Kenya

2020 ◽  
Vol 16 (10) ◽  
pp. 1364-1371
Author(s):  
Ofuyo Dorcus ◽  
Opala Peter ◽  
Odhiambo George
Keyword(s):  
Economic Evaluation ◽  
Cropping Systems ◽  
Phosphate Fertilizer ◽  
Western Kenya ◽  
Fertilizer Use

scholarly journals Does the inverse farm size productivity hypothesis hold for perennial monocrop systems in developing countries? Evidence from Kenya

2021 ◽  
Vol 16 (3) ◽  
pp. 237-252
Author(s):  
Josiah Ateka ◽  
◽  
Perez Ayieko Onono-Okelo ◽  
Martin Etyang ◽  
◽  
...  
Keyword(s):  
Developing Countries ◽  
Survey Data ◽  
Agricultural Policy ◽  
Cropping Systems ◽  
Household Survey ◽  
Farm Size ◽  
Mixed Cropping ◽  
Western Kenya ◽  
Household Survey Data ◽  
Robust Measures

The inverse farm size and productivity relationship (IR) is a recurring theme in the literature. However, most previous studies were undertaken within a setting of mixed cropping systems. In this article, we investigate the effect of farm size on productivity within the context of a perennial monocropping system, acute competition for farmland, frequent subdivision of farms and declining yields. We apply household survey data of smallholder tea farms in western Kenya and consider both technical efficiency (TE) and the yield per hectare as indicators of productivity. The findings show that the effect of farm size on productivity is nonlinear, with TE initially declining and then rising with farm size. The findings also demonstrate that the farm size and productivity relationship is important for perennial monocrops and that the use of robust measures of productivity is important for the IR. The findings have important implications for agricultural policy in developing countries.

scholarly journals Economic Evaluation of Rice-Based Cropping Systems under Rainfed Medium Land Situation of Assam

2020 ◽  
Vol 9 (4) ◽  
pp. 1960-1964
Author(s):  
Jayanta Kalita ◽  
H. C. Bhattacharyya ◽  
R. K. Thakuria ◽  
D. Bhattacharyya ◽  
A. Sarmah ◽  
...  
Keyword(s):  
Economic Evaluation ◽  
Cropping Systems

scholarly journals Soil Quality Characteristics as Affected by Continuous Rice Cultivation and Changes in Cropping Systems in South China

Agriculture ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 443
Author(s):  
Xiangning Ren ◽  
Feixiang Chen ◽  
Tao Ma ◽  
Yueming Hu
Keyword(s):  
Soil Quality ◽  
Soil Ph ◽  
South China ◽  
Cropping Systems ◽  
Quality Characteristics ◽  
Paddy Soils ◽  
Paddy Fields ◽  
Fertilizer Use ◽  
Use Efficiency ◽  
C And N

This study was conducted to elucidate how changes in critical soil quality characteristics relate to continuous rice cultivation and changes in cropping systems and fertilization in South China over the time span 1980 to 2017. Soil pH, soil organic matter (SOM), total nitrogen (TN), available phosphorus (AP) and potassium (AK) were determined for the samples taken in 2017 and compared to results from the paired samples collected in 1980 by grouping all samples into four cropping systems: continuous paddy fields, new paddy fields developed from uplands, continuous uplands, and new uplands developed from paddy soils. The results show a significant increase in soil pH, AP and AK in all cropping systems, which was, however, coupled with low fertilizer use efficiency. Additionally, a significant increase in SOM came with new paddy soils, whereas a little SOM accumulation and a significantly weakened correlation of TN to SOM occurred in continuous paddy soils. Both low fertilizer use efficiency and deteriorated soil C sequestration function imply a sub-health status of continuous paddy soils. The changes in cropping systems and fertilization, which essentially resulted from expeditious economic growth, should be responsible for the dynamics of C and N and the consequences to soil quality. More experimental studies on balanced fertilization vs. local commonly used fertilization are suggested to probe the mechanisms underlying the C and N dynamics in paddy soils.

Bio-economic evaluation of farmers’ perceptions of viable farms in western Kenya

2006 ◽  
Vol 90 (1-3) ◽  
pp. 243-271 ◽  
Author(s):  
M.M. Waithaka ◽  
P.K. Thornton ◽  
M. Herrero ◽  
K.D. Shepherd
Keyword(s):  
Economic Evaluation ◽  
Western Kenya

ADOPTION POTENTIAL OF HEDGEROW INTERCROPPING IN MAIZE-BASED CROPPING SYSTEMS IN THE HIGHLANDS OF WESTERN KENYA. 1. BACKGROUND AND AGRONOMIC EVALUATION

1997 ◽  
Vol 33 (2) ◽  
pp. 197-209 ◽  
Author(s):  
K. D. SHEPHERD ◽  
J. K. NDUFA ◽  
E. OHLSSON ◽  
H. SJÖGREN ◽  
R. SWINKELS
Keyword(s):  
Grain Yield ◽  
Leucaena Leucocephala ◽  
Cropping Systems ◽  
Calliandra Calothyrsus ◽  
Hedgerow Intercropping ◽  
Western Kenya ◽  
Agronomic Evaluation ◽  
Socio Economic Variables ◽  
And Control ◽  
Agroforestry Technologies

The biophysical performance of hedgerow intercropping for soil fertility inprovement was assessed in a farmer-participatory trial in western Kenya over three years. Farmers successfully established dense hedgerows (median 6680 trees ha−1 on plots of 790 m2, but annual yields of hedgerow prunings of Leucaena leucocephala and Calliandra calothyrsus (1–4 t ha−1), were low compared to potentials in the region (4–8 t ha−1). The hedgerows reduced slopes from 7.2 to 4.5% within alleys (p < 0.01) but had no effect on grain yield over five seasons. Little of the variation in grain yield between hedgerow plots and control plots without hedgerows (adjusted r2 = 11%) and among control plots (adjusted r2 = 29%) could be accounted for by linear regression with measured agronomic and socio-economic variables. Fully researcher-managed trials are recommended for agronomic evaluation of complex agroforestry technologies.

scholarly journals Response of soybean (Glycine max L.) to application of lime and phosphate fertilizer in an acid soil of western Kenya

2020 ◽  
Vol 5 (4) ◽  
pp. 470-475
Author(s):  
Peter Asbon Opala
Keyword(s):  
Glycine Max ◽  
Significant Interaction ◽  
Soil Acidity ◽  
Acid Soil ◽  
Dry Weight ◽  
Phosphate Fertilizer ◽  
Western Kenya ◽  
P Fertilizer ◽  
Glycine Max L ◽  
Better Than

The effect of combining lime and phosphate fertilizer on the performance of soybean (Glycine max L.) was investigated in a pot experiment consisting of nine treatments of three rates of lime (0, 4 and 8 t ha−1) in a factorial combination with three rates of phosphorus (0, 15, and 30 kg P ha−1) at Maseno University in western Kenya. There was a significant interaction between the lime and phosphorus rate on the biomass dry weight of soybean. At the rates of 0 and 4 t ha-1 of lime, the biomass dry weight of soybean increased with increasing rates of phosphorus but at 8 t ha-1 of lime, the dry weight of soybean increased from 0 to 15 kg P ha-1 but declined at 30 kg P ha-1. There was however no significant interaction between lime and P rates on grain weight but the effects of both P and lime rate were significant. When applied without lime, 30 kg P ha-1 gave significantly higher grain (5.3 g pot-1) weight than 15 kg P ha-1 (1.6 g pot-1) of soybean, which was also significantly better than the control (0.0 g pot-1). When applied without phosphorus, both lime rates at 4 and 8 t ha−1 significantly increased grain weights of soybean compared to the control, but the grain weights of soybean between the two lime rates did not differ significantly. The highest yields of soybean were obtained when 4 t ha−1 of lime was applied with 30 kg P ha−1 (19 g pot-1). Therefore, this study demonstrates that the ameliorating deleterious effects of soil acidity through liming should simultaneous be accompanied by application of P fertilizer at appropriate rates.

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