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The most important constraint to potato production in the UK is the damage caused by the potato cyst nematodes (PCN) Globodera pallida and Globodera rostochiensis. These are serious pests, capable of causing substantial yield loss. Modern management systems depend heavily on nematicides which, at c. £360 ha−1 for granular and c. £550 ha−1 for fumigant nematicides, are costly to use. Mapping field...
The soil mantles the land, except where there is bare rock or ice, and it varies more or less continuously. Many of its properties change continuously in time, too. We can measure the soil at only a finite number of places and times on small supports, and any statement concerning the soil at other places or times involves prediction. Variation in soil is also complex, so complex that no description...
A typical geostatistical analysis of soil data proceeds on the assumption that the properties of interest are the outcomes of random processes. Is the assumption reasonable? Many factors have contributed to the soil as we see it, both in the parent material and during its formation. Each has a physical cause, each must obey the laws of physics, and each is in principle deterministic except at the...
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