Coconut-gliricidia mixed cropping systems improve soil nutrients in dry and wet regions of Sri Lanka

2021 ◽  
Author(s):  
S. A. S. T. Raveendra ◽  
Sarath P. Nissanka ◽  
Deepakrishna Somasundaram ◽  
Anjana J. Atapattu ◽  
Sylvanus Mensah
Keyword(s):  
Sri Lanka ◽  
Soil Nutrients ◽  
Cropping Systems ◽  
Mixed Cropping

Whole-tree Harvesting Depletes Soil Nutrients

1974 ◽  
Vol 4 (4) ◽  
pp. 530-535 ◽  
Author(s):  
Edwin H. White
Keyword(s):  
Soil Nutrients ◽  
Nutrient Removal ◽  
Cropping Systems ◽  
Soil Nutrient ◽  
Site Conditions ◽  
Nutrient Pool ◽  
Whole Tree Harvesting ◽  
The Impact ◽  
Whole Tree ◽  
Tree Harvesting

This paper reports the effects of whole-tree harvesting of eight cottonwood stands on the soil nutrient pool. The data indicate possible site degradation by depletion of soil reserves of N, P, and K but not Ca and Mg on a range of alluvial site conditions in Alabama. Foresters must establish the rate of nutrient removal in intensive tree cropping systems for a variety of species and sites and develop prescriptions to minimize the impact.

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 Yield performance of lentil as a mixed crop with rapeseed

2015 ◽  
Vol 17 (1) ◽  
pp. 33-40
Author(s):  
MS Islam ◽  
MA Islam ◽  
MA Begum ◽  
M Maniruzzaman ◽  
MAU Alam
Keyword(s):  
Cropping Systems ◽  
Cropping System ◽  
Cost Ratio ◽  
Mixed Cropping ◽  
Net Return ◽  
Benefit Cost Ratio ◽  
Mixed Crop ◽  
Testing Site ◽  
Benefit Cost ◽  
Equivalent Yield

Mixed crop cultivation of lentil and rapeseed could be a promising technology for yield maximization. The field experiment was carried out at multilocation testing site, Kashinathpur, Pabna during the rabi season of 2011-12 and 2012-13 to verify the performance of rapeseed as mixed crop with lentil at different seeding ratios. The treatment comprises for the experiment were T1: Sole lentil (100%), T2: Sole rapeseed (100%), T3: Lentil (100%) + Rapeseed (10%), T4: Lentil (100%) + Rapeseed (20%), T5: Lentil (100%) + Rapeseed (30%) and T6 :Farmers’ practice :Lentil (100%) + Rapeseed (15%). The highest lentil equivalent yield (2.22 t ha-1 in and 2.48 ) and maximum land equivalent ratios (1.27 and 1.28) were observed in T4 treatment in 2011-12 and 2012-13, respectively.. It was noted that all the mixed cropping systems produced higher equivalent yield and LER than that of their corresponding sole crops. . Cost and return analysis showed that the highest net return (Tk. 127774 ha-1) was found in T4 treatment while sole rapeseed gave the lowest net return (Tk. 60540 ha-1). Net return was always higher under mixed cropping system than that of sole cropping. The highest benefit cost ratio 3.48 was recorded from Lentil (100%) + Rapeseed (20%) where as the minimum (1.39) from soli rapeseed.Bangladesh Agron. J. 2014, 17(1): 33-40

scholarly journals Comparative Assessment of Vegetable Crop Performances and Ecological Indicators during Transition from Conventional to Ecological Agriculture

2021 ◽  
pp. 1-9
Author(s):  
L. H. P. Gunaratne ◽  
K. S. Hemachandra ◽  
Y. M. K. Kumudumali ◽  
N. K. G. K. R. Manawasinghe ◽  
H. G. A. S. Sathischandra ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Crop Yields ◽  
Cropping Systems ◽  
Insect Pest ◽  
Vegetable Crop ◽  
Department Of Agriculture ◽  
Ecological Agriculture ◽  
Conventional Agriculture ◽  
Land Equivalent Ratio ◽  
Tropical Conditions

Selected field vegetable crop combinations and increasing dosage of bio-char application, together with other alternative agronomic components of ecological agriculture (EA) were compared with conventional agriculture (CA) during the first three seasons of transition from CA to EA under hot-humid tropical conditions and sandy regasolic soils in Kalpitiya, Sri Lanka. The recommendations of the Department of Agriculture (Sri Lanka) was followed for managing conventional agriculture plots while alternative ecological options were followed for plant nutrient and pest managements. Capsicum-beet, Okra-beet and mae-spinach and radish-onion crop combinations could be selected for intercropping under ecological as well as conventional cropping systems based on their yield performances (Land Equivalent Ratio -LER) or other yield components. Even though plant growth rates and crop yields were lower at the beginning, EA was able to outrank CA by the third consecutive season. A bio-char amendment of 2 kg m-2 could be identified as the best among the different dosages tested. Soil N, P and K contents were increased while accumulation of Cd and Hg were reduced at the end of a three season long ecological agriculture practices. Insect pest/natural enemy incidence were not different between two cropping systems.

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