Understanding soil fertility issues in the Middle Mountains of Nepal requires interdisciplinary research,
integrating biophysical and socio-economic factors. Soil degradation is associated with a wide range of
human activities, natural processes, and the wider economic, political and social aspects of their setting.
This study focuses on a in the Middle Mountains and addresses four research questions:
What is the current soil fertility status? How is it changing? Why is it changing? and What are the
implications for production, sustainability and management? Soil surveys, plot studies, nutrient balance
modelling, household questionnaires and GIS mapping techniques are used to address these questions.
The overall soil fertility conditions of the study area are poor and appear to be declining under most land
uses. Soil pH averages 4.8 ± 0.4 and is below desirable levels for crop production. Soil carbon (0.99 ± 0.5
%) and cation exchange capacity (10.8 ± 4.1 cmol kg⁻¹) are low, and available phosphorus (16.6 ± 18.9
mg kg⁻¹) is a concern given the low pH. Land use is the most important factor influencing soil fertility with
khet (irrigated agriculture) showing the best fertility status (pH 5.2, Ca 5.3 cmol kg⁻¹ and available P 21.6
mg kg⁻¹), followed by bari, and grassland, with forest soil fertility being the poorest (pH 4.2, Ca 0.9 cmol
kg⁻¹ and available P 0.7 mg kg⁻¹). Soil type is the second most important factor influencing soil fertility,
with red soils displaying significantly lower available P than non-red soils (9.8 versus 22.1 mg kg⁻¹).
Phosphorus sorption studies indicate the high P fixation capacity of red soils, 1.2 g kg⁻¹ compared to 0.3 g
kg⁻¹ calculated for non-red soils. Extrapolation from site specific data to a spatial coverage using statistical
analysis and GIS techniques indicates that only 14% of the classified areas have adequate pH, available P
and exchangeable Ca, and 29% of the area has a high P fixation capacity (>1.5 g kg⁻¹).
Nutrient balance modelling provides estimates of nutrient depletion from the soil pool and raises concerns
about the sustainability of upland farming, intensive vegetable crop production and forest nutrient cycling.
Dryland maize production results in deficits of 188 kg N, 38 kg P205 and 21 kg Ca per ha furrow slice Rice-wheat cultivation on irrigated land appears to have limited impact on the soil nutrient pool, but the
addition of premonsoon maize to the rotation results in deficits of 106 kg N and 12 kg P₂O₅ per ha furrow
slice. Rates of soil fertility depletion estimated from differences in soil fertility between land uses indicate
substantial N and Ca losses from forest land (94 and 57 kg ha per furrow slice respectively).
Land use change, the impact on nutrient flows and relationships between nutrient inputs, crop uptake,
nutrient balances and soil fertility provide an understanding of why soil fertility is changing. Historical
forest cover data indicates substantial deforestation during the 1950-1960 period, a subsequent reversal in
the 1972-1990 period associated with afforestation efforts, and renewed losses in the 1990s. Forest soils
receive minimal nutrient inputs and large biomass removal results in a low soil fertility status. Expansion
and marginalization of dryland agriculture were noted from 1972-1990, as former grazing, shrub and
abandoned lands were terraced and cultivated. Nutrient fluxes indicate that inputs are insufficient to
maintain the soil nutrient pool under dryland cultivation due to the high nutrient requirements of maize and
nutrient losses through erosion. Nutrient balances for maize and wheat are positively correlated with
nutrient inputs but relationships with soil fertility are weak. On irrigated khet lands, cropping has
intensified and cash crop production has prompted the use of agrochemicals. Excess fertilization is leading
to eutrophication and the high use of agrochemicals is a health concern. Nutrient fluxes on khet fields
appear to be sustainable due to the addition of nutrients through irrigation and sediment trapping, but may
be insufficient to maintain triple cropping. Grass and shrub land dynamics are characterized by minimal
inputs and low productivity. The traditional farming system appears to have been sustainable, but triple
cropping and increased vegetable production are threatening sustainability. The transfer of nutrients
within the fanriing system is unbalanced. Under intensive production, nutrients on khet land are being
depleted, poor farmers are shifting their limited compost inputs from bari to khet fields, and biomass
collected from forests, disrupts the natural nutrient cycle. Population growth, land tenure, culture and poverty are the underlying socio-economic factors which
influence farming system dynamics, directly impact nutrient inputs, and indirectly drive soil fertility
degradation. Population growth rates of 2.6% have contributed to agricultural intensification and
marginalization, and pressure on forest resources. The distribution of land is highly skewed with 15% of
the surveyed households owning 46% of the land. Women play a central role in soil fertility management
through their responsibilities for livestock care, litter collection and compost application, but increasing
workloads related to commercial milk production, cash cropping and the off-farm employment of males
are a major concern. Agricultural assets, farm gross margins, market oriented production, commercial
milk production and off-farm employment provide indicators of economic well-being and are positively
correlated with nutrient inputs. Total returns and gross margins are greatest for households growing
vegetable crops as part of their rotation, and these households apply significantly more compost and
fertilizer to both khet and bari land. Access to land is a key factor driving nutrient management and
influencing economic well-being. Land is the main agricultural asset in the study area, khet land is the
most productive and khet provides the greatest opportunity of cash crop production. However, given the
increased labour demands for triple cropping, vegetable production and commercial milk production, the
social sustainability is being threatened. Some 47% of the households were not able to fulfil their basic
need requirements from the land they farm. They will have no alternative but to exhaust the capital stock
of soil nutrients rather than investing in soil fertility.
Maintenance of soil fertility is essential to meet the basic food and resource needs of the growing
population. Organic matter management is critical, supplying macro- and micro nutrients, reducing
acidification, maintaining soil structure and enhancing microbial activity. Water management and sediment
trapping on lowland fields provide additional nutrients on khet land; soil acidity on upland fields and forest
land needs to be better managed given the increased fertilizer use on bari and high biomass removal from
forests; and the incorporation of N fixing species into agricultural production systems are an option which
may provide additional animal fodder and help sustain soil fertility. / Graduate and Postdoctoral Studies / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/6728 |
| Date | 11 1900 |
| Creators | Brown, Sandra J. |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Format | 21728293 bytes, application/pdf |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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