Read e-book online Potatoes postharvest PDF

Read e-book online Potatoes postharvest PDF

By R T Pringle, C F H Bishop, R C Clayton

This e-book concentrates at the crucial ideas of garage, grading and dispatch of potatoes. the point of interest is the potato tuber and the entire impacts which may have an effect on its ultimate caliber while offered. history info resembling the tuber's actual improvement, its metabolic tactics, its susceptibility to break and affliction are supplied the place this aids knowing as to why kept plants advance the issues they do. on hand In Print

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Sample text

A) Cross-section of tuber periderm; (b) suberization after wounding. 2. Days to various stages of wound healing. 3 Light suberization Complete suberization Start of periderm formation Two layers of periderm formed 7–14 4 1–2 21–42 7–14 3–6 28 7–14 3–5 28–63 9–16 5–7 Dehydration of tubers Ninety-eight per cent of the moisture that leaves a tuber during storage is lost through its skin by evaporation (Fig. 20). 4% leaves the tuber via the lenticels along with the carbon dioxide produced by respiration, it being a wet gas (Burton, 1989).

Various computer programs are available to calculate optimal irrigation required during tuber initiation and range from simple water balance calculations based on rainfall, irrigation water evaporation and leaching, to more sophisticated models that take account of crop canopy and evapotranspiration, through to direct measurement of soil moisture status using various measuring devices. , 1999) and susceptibility to bruising (Fellows, 2004). Rapid changes in soil moisture status, from very dry to very wet, towards the end of the growing season can cause splitting or cracking of tubers (Fig.

2003). This phenomenon is fortunately fairly rare but those reported cases support routine sampling and testing for tuber skin set and dry matter content, which can be used to adjust fertilizer applications in future years. g. 4. How stress can lead to disease Stresses of various kinds can weaken potato plants’ natural defences to such an extent that disease development becomes easier. For example, extremely low temperatures (Wright, 1942) can lead to cellular membrane damage which can make bacterial access much more likely and result in soft rotting.

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