"We have seen a creeping process of farmers being forced out of the buffer zone around Gaza's border. Before 2000 we could approach and farm within 50m of the fence. After Israel's evacuation of the settlements in 2005, the Israeli army imposed a buffer of 300m. Although it is elastic, now there are areas, depending on the situation, where farmers cannot reach their farms in safety within an area of over a kilometre. It is indirect confiscation by fear. My fear is that, if it remains, it will become de facto. Bear in mind that 30% of Gaza's most productive land is within that buffer zone."
The wholesale destruction of farms, greenhouses, dairy parlours, livestock, chicken coops and orchards has damaged food production, which was already hit by the blockade.
Buildings heavily damaged during Israel's Operation Cast Lead included much of its agricultural infrastructure. The Ministry of Agriculture was targeted, the agriculture faculty at al-Azhar university in Beit Hanoun largely destroyed, and the offices of the Palestinian Agricultural Relief Committees in Zaitoun - which provides cheap food for the poor - ransacked and vandalised by soldiers who left abusive graffiti.
Although international and local officials are still gathering figures, they believe that scores, perhaps hundreds, of wells and water sources have been damaged and several hundred greenhouses have been levelled, as well as severe damage inflicted on 60,000-75,000 dunums of Gaza's 175,000 dunums (44,000 acres) of farmable land.
As well as the physical damage done by Israeli bulldozers, bombing and shelling, land has been contaminated by munitions, including white phosphorous, burst sewerage pipes, animal carcasses and even asbestos used in roofing. In many places, the damage is extreme. In Jabal al-Rayas, once a thriving farming community, every building has been knocked down, and even the cattle killed and left to lie rotting in the fields.
In al-Atatra, Ahmad Hassan, 65, the overseer of an orchard that once had hundreds of lemon and orange trees, surveyed an area flattened by bulldozers. "This was the well," he said, showing a pile of bulldozed concrete. "We can clear the ground in two weeks. Then what? The well is gone. The pump has been destroyed. And where will the trees come from to replant the land?"
Van Nieuwenhuyse said: "Already, the price of meat has tripled since the Israeli operation began. What is more worrying is the situation over vegetables. Protein we can help with, but before this there were already deficiencies in the diet. Now they will have to rely on Israel."
It was a view echoed by Hassan Abu Etah, the deputy agriculture minister in Gaza. "It has all been hugely damaged. And it affects all of Gaza, not simply the farmers. We produced some of what we needed. It makes you wonder whether they wanted to change Gaza from production to consumption."
In the heavily damaged village of Khuza'a, near Khan Younis, Salam Najar surveyed the no-go zone that extends from the last houses in the village to the border fence where Israeli farmland begins. "Most of the families here have farmed that side. Now no one feels safe to go there. They have destroyed it all."
© Guardian News and Media Limited 2009