Protection technologies for family agriculture in desert conditions
The problems facing agricultural production systems are to increase the productivity, to improve the product quality, and to manage natural resources more efficiently. Indeed, developing sustainable and improved farming systems would have a significant impact on helping desert countries to be less dependent on food imports.
Some important lessons can be drawn from the Arabian Peninsula Regional Program (APRP), funded by the Arab Fund for Economic and Social Development (AFESD) and the International Fund for Agricultural Development (IFAD), developed since 1995 by the International Center for Agricultural Research in the Dry Areas (ICARDA) upon the request from the Arabian Peninsula National Agricultural Research Systems (NARS). Family agriculture in desert conditions in different geographical areas can hugely benefit from the experience with protection technologies such as net-house, soil-less culture (hydroponics), less chemical pesticides and a simplified protection technology.
Enhanced cash crop production using net-house
ICARDA and NARS have developed net houses throughout the Arabian Peninsula since 2008. Net house is a
greenhouse structure covered by an insect proof net which can allow vegetable production in desert conditions 8-9 months of the year with high yield. Studies in the region have shown that the net benefit income of net-house in 8-9 months is about the same as cooled greenhouses in 12 months due to savings in cooling water and electricity and other costs.
Net house technology, after its introduction by ICARDA and NARS, has been accepted widely in the region by policy makers and end-users. For example, in UAE, the Ministry of Climate Change and Environment has supported many growers since 2009 to adopt such techniques. Similarly, in Oman, Qatar, Bahrain and Saudi Arabia growers are adopting net houses.
Considering the average monthly temperatures, the production of high value cash crops such as tomato & cucumber
can be carried out at least for 8-9 months of the year under the net house. The net house protects crops from the harsh environment, while providing them with good ventilation, and additional benefits of protection against pests and diseases. In UAE, the production of cucumber crop under cooled and net house was studied at 18 farms in three different regions. The results show that net house production in winter are as high as cooled greenhouses.
One of the constraints of production under net houses is the limited production period compared to greenhouses. Even with savings from the reduced cost of establishment, water and energy for cooling, and profits about the same as from cooled greenhouses, growers still prefer their greenhouses in production year around.
To address this, ICARDA is working on different innovative solutions including spot cooling (SC) and root zone cooling (RZC) combined with utilizing solar energy. The RZC shows promising results. ICARDA-APRP supported a PhD study in Oman to build a locally developed system for controlling the nutrient solution to the ideal temperature of 18-29° C. The studies show that cucumber yield in hydroponics during summer can significantly increase with utilizing the RZC. Furthermore, ICARDA is conducting a joint experiment with American University of Ras Al-Khaima on spot cooling concept in greenhouse using solar energy with some promising results.
The records show that net houses saved about 77% of water with a 10% increase of profitability compared to the cooled greenhouse in Oman during November-February, and, March-May 2017. This does not consider the high cost of establishment of cooled greenhouses compared to net houses. In cooled greenhouses, the water consumed for cooling was 4 times higher than irrigation water. During this period the net houses saved 28.5m3 of water per ton of cucumbers produced.
Soil-less culture (hydroponics) in greenhouses under desert conditions.
The production of high value crops requires a certain quantity and quality of water that is practically impossible to obtain in desert agriculture such as the Arabian Peninsula.
The present conventional growing system for vegetable crops involves a lot of water wastage due to evaporation, run off and deep percolation. In arid countries like those in the Arabian Peninsula, rapid evaporation from the soil surface may also lead to salinity problems. Limited natural resources for fertilisation and increased soil borne pathogens and salinity are limiting the agricultural development.
Since the year 2000, ICARDA has conducted several collaborative adaptive research and agro-economic studies with NARS scientists in the Arabian Peninsula (AP) countries on soil-less culture in greenhouses under desert
conditions. Yields were increased significantly and productivity per unit water increased by more than 70% compared to soil-based systems. Now a large group of growers has adopted this production system. In 2017, more than 1020 and 350 greenhouses were converted to soilless system in UAE and Oman respectively. Soilless culture techniques offer: (a) supply of water and nutrients optimum for plant growth, (b) minimal water loss by evaporation, due to the narrow width of the growing channels, and (c) elimination of drainage water loss, since water is returned to the tank for recycling (closed system).
The main disadvantages of soilless systems are the initial cost and the increased technical demands associated with management. The cost of installing such a system is high, and, at first sight, might seem prohibitive, especially for smallholder farmers. But, through increased production and savings in labor, water, energy and fertilizer, growers can recover their initial investment quickly.
The records obtained in Saudi Arabia and UAE confirmed that soilless agriculture permitted saving up to 120m3 of water per ton of tomato produced. In Kuwait and Oman vertical soilless production system resulted in increasing strawberry yield by 5 times with 50% less water compared to conventional greenhouse production system. In Yemen, the soilless production system was adopted in several pilot farms. Growers managed the production with the technical support of NARS researchers who were trained previously by ICARDA.
Integrated production and protection management (IPPM) in desert conditions
The extensive use of chemicals to control diseases and pests in greenhouses results in complex problems of insect
resistance, and health and environmental hazards. Crops can be protected by control measures that avoid heavy reliance on pesticides. These control measures are part of an Integrated Production and Protection Management (IPPM) program developed by ICARDA.
IPPM components encompass environment management and control (heating, cooling, ventilation); irrigation and fertigation management and control; agricultural management (appropriate cultivars, growing media, nursery, plant density); and mechanical control (insect-proof net, plastic mulch, insect traps, et), biological control, and chemical control. Some of the techniques are just as easy as covering all greenhouse ventilation with insect proof net and using double door, while there are more complicated techniques such as biological control with the introduction of specific predatory insects.
The main constraint for further expansion of IPPM is training the growers and end users on the proper selection, combination and application of IPPM techniques.
IPPM technology, after being introduced by ICARDA and NARS, has been accepted widely in the Arabian Peninsula region by policy makers and end-users. About 70 to 80% of growers have adopted the IPPM package in Oman and UAE. The initial adoption of IPPM practices in research stations and by some growers in the Gulf Cooperation Council countries, Yemen and Afghanistan was successfully proven by the production of high yield and quality of fresh products free of pesticide chemicals. Applying IPPM techniques for Protected Agriculture resulted in: 80% reduction in agrochemical use in Protected Agriculture greenhouses in Yemen; 61% increase in yield in Oman; 45% increase in greenhouse grower incomes in Yemen; 15% increase in grower cucumber production in Oman; > 50% water saving in all Arabian Peninsula countries. Implementing IPPM techniques provided farmers with better income, as well as produced healthy high-quality cash crops with minimum pesticide residue.
A socio-economic study in Dhamar (Yemen) compared two greenhouses with and without IPPM application. IPPM resulted in the reduction of pesticide spray from 22 times to 2- or 3-times, using safe pesticides. It gave better yield per unit of area and 53% increase in net return compared to the control green houses. It involved keeping the relative humidity low, covering ventilation with insect proof nets and using plastic mulch as well as applying irrigation sparingly. Plants showed to be strong and healthy, with low incidences of pests and disease. Application of IPPM increased water use efficiency by about 50% and cut down the pesticide applications from 18-22 to 2-3 per season. Yield of cucumber was 15.2 kg/m2 under IPPM while in the control the total yield was 12.9 kg/ m2. Accordingly, the water-use efficiency was significantly better under IPPM (32.5kg/m3 compared with 21.8kg/m3 for the control). Farmers’ assessments of the IPPM technique were positive. This was reflected in the increased demand for the mesh and plastic mulch in the local markets, which could be inferred that more farmers will ensure the use of IPPM technique because of the obvious benefits gained.
Simplified Protected Agriculture Technology in Afghanistan.
ICARDA started in 2004 a three- year project for transferring the simplified Protected Agriculture (PA) for cash crops production to Afghan growers. This was the first time PA was introduced to growers in Afghanistan.
The project was designed with the main aim to promote the adoption of affordable and sustainable high intensity production system for cash crops using marginal or otherwise non-productive lands and with high water productivity. This was achieved by installing simple greenhouse structures at selected pilot farmers’ sites. The criteria for selecting the farmers were based on group discussions and farmers’ meetings in which the concepts of the project were discussed.
The project originally covered 65 growers in six provinces and helped them to produce high quality cash crops. PA and associated techniques, including Integrated Production and Protection Management, have been simplified for adoption by growers who have never worked with greenhouses. All participating farmers were from the active segments of the farming communities in Kabul, Kunduz, Parwan, Ghazni, Helmand and Nangarhar. Many family members including women and children were involved in the greenhouse’s day to day production and management.
Beside the positive impact on rural-family nutrition and food security, the impact of the greenhouse technology on growers’ incomes was assessed. All growers interviewed have not changed their cropping patterns, including the number of crops or the size of land they cultivated prior to their induction to PA. Therefore, for these farmers the greenhouses were “add-ons” to the portfolio of crops they grow and to their incomes. Protected Agriculture contributed up to 135% increase in income generated from crop production in 2005. This economic success has somehow catalyzed the interest of farmers who expressed their willingness to accept more structures. In Afghanistan, most rural people produce to meet their own food needs and are thus involved in subsistence agriculture. Protected Agriculture provides opportunities for market oriented and high-quality cash crop production which significantly increase smallholder farmers’ income.
The main constrains included relatively low level of know-how among growers which led the project to organize several training courses. The availability of greenhouse structures was also another shortcoming. The project developed a Protected Agriculture Center in Kabul with a workshop for manufacturing greenhouse structures. The same center was also equipped with 4 greenhouses and classrooms to be used as training facilities where 360 growers, extension agents, and researcher were trained on PA. Local technicians were also trained in manufacturing aspects and most of the items required were purchased locally. Most of the machineries were also purchased locally. Establishment of this facility contributed tremendously to reducing the initial capital that was required to invest in the structure. The workshop produced good quality greenhouses for about 40% less than the cost of imported ones.
Protected agriculture is very promising
- Protected agriculture is very promising with respect to the use of marginal land, labor and water, and had effectively made positive impacts on the income generation capacity of many growers.
- Simplified Protected Agriculture has the potential to contribute significantly to both the development of rural communities and to the economy of resource poor areas.
- It can play an important role in supplying local markets with fresh produce that could not be grown otherwise. It creates employment for rural communities and productive opportunities for the disadvantaged, particularly women, returning (landless) refugees, and the disabled.
- It also offers the potential for the development of a private service sector in the construction and supply of PA equipment.
- Ultimately, high yielding and quality products from PA could be expanded to serve the export market and generate a valuable source of foreign revenue.
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