Water Quota Cut on an Arava Pepper Farm
Moshav Ein Yahav in the Arava produces peppers in 120 dunams of greenhouses. The farm's water quota is 850 m³ per dunam per year, but the water authority proposes a 30% cut because of falling groundwater levels. Peppers yield 12 tonnes per dunam and sell for an average of 6 NIS per kg in the November–March European window; production costs are 45,000 NIS per dunam, and water costs 1.8 NIS per m³. The alternative is date palms, which yield 1.5 tonnes per dunam, sell for 15 NIS per kg, cost 9,000 NIS per dunam to grow, and need only 600 m³ per dunam per year. However, dates take seven years to mature and require winter heat. Desalinated water can be bought at 4.5 NIS per m³, but only 30,000 m³ per year is available. The moshav must decide whether to fallow 30% of the greenhouses, buy desalinated water, or convert part of the farm to dates.
1. Calculate the gross margin per dunam for peppers under full water, peppers under a 30% water cut with yield falling proportionally, and dates. Show your reasoning.
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Peppers, full water:
- Revenue = 12,000 kg × 6 NIS = 72,000 NIS.
- Water cost = 850 m³ × 1.8 NIS = 1,530 NIS.
- Other costs = 45,000 NIS.
- Gross margin = 72,000 − 45,000 − 1,530 = 25,470 NIS/dunam.
Peppers, 30% cut: water = 595 m³. If yield falls proportionally, yield = 12 × 0.70 = 8.4 tonnes = 8,400 kg.
- Revenue = 8,400 × 6 = 50,400 NIS.
- Water cost = 595 × 1.8 = 1,071 NIS.
- Gross margin = 50,400 − 45,000 − 1,071 = 4,329 NIS/dunam.
Dates:
- Revenue = 1,500 kg × 15 NIS = 22,500 NIS.
- Water cost = 600 × 1.8 = 1,080 NIS.
- Other costs = 9,000 NIS.
- Gross margin = 22,500 − 9,000 − 1,080 = 12,420 NIS/dunam.
The comparison shows why the quota cut is serious: pepper margin falls from 25,470 to 4,329 NIS/dunam if yield is proportional. Dates are less profitable per dunam than full-water peppers but much better than deficit peppers, and they use 250 m³ less water per dunam.
2. Evaluate the three options - fallow 30% of the greenhouses, buy desalinated water, or convert part of the farm to dates - using water productivity and transition costs.
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Use gross margin per m³ of water as the comparison:
- Full-water peppers: 25,470 ÷ 850 ≈ 30 NIS/m³.
- Deficit peppers: 4,329 ÷ 595 ≈ 7.3 NIS/m³.
- Dates: 12,420 ÷ 600 ≈ 20.7 NIS/m³.
Fallow 30% keeps the remaining 84 dunams at full water and full margin: 84 × 25,470 ≈ 2.14 million NIS. It is simple but sacrifices 30% of the farm's best crop and leaves labour and packing capacity underused.
Buy desalinated water is the highest-value use of the limited 30,000 m³. Each dunam needs 255 m³ extra to restore full water, so 30,000 m³ restores about 117.6 dunams. The extra water costs 255 × 4.5 = 1,147.5 NIS/dunam, leaving a margin of about 24,322 NIS/dunam - far above deficit peppers or dates. The limitation is that 30,000 m³ is slightly less than the 30,600 m³ needed for all 120 dunams, so a small area remains deficit.
Convert to dates gives 12,420 NIS/dunam and saves water, but the seven-year maturation is a major transition cost: no date income during that period, plus loss of pepper income on converted land. Dates are therefore a long-term diversification option, not a quick fix for the quota cut.
The ranking is: buy desalinated water first, convert only land that cannot be watered, and use fallowing as a last resort.
3. Recommend a practical allocation of the 30,000 m³ desalinated water and any conversion to dates. Explain the risks.
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Allocation. Use the desalinated water first on peppers, because their marginal value per m³ is highest. The 30,000 m³ restores about 117 dunams to full water (117 × 255 ≈ 29,835 m³), leaving about 3 dunams on deficit irrigation or fallow. Do not spread the desalinated water thinly across all 120 dunams; concentrating it on the highest-yielding greenhouse blocks protects the export window and the farm's packing operation.
Dates. Convert a small area - for example 5–10 dunams - to dates only if the farm can absorb seven years without income and has winter heat suitable for the chosen variety. Do not convert the best pepper land. Use the least productive or most saline plots. Dates reduce water demand and labour at harvest, but they are not a short-term response to the 30% cut.
Risks. Desalinated water costs 4.5 NIS/m³, so the margin depends on pepper prices; a price fall below about 5 NIS/kg would erode the advantage. The 30,000 m³ supply may not be guaranteed. Deficit irrigation may reduce pepper size and export grade more than the proportional yield assumption. Date conversion carries market and climate risk, and the seven-year wait is a cash-flow problem. Monitor soil salinity, yield and water use, and review the allocation after two seasons.