Download Organic viticulture an Australian manual by David Madge PDF

By David Madge

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Because of the topic's complexity, this section concentrates on the relevance of major aspects of soil management specifically from an organic management perspective. Overall management of the soil as a resource, and specific management of the nutrient cycle, are addressed separately. Reference is made to some of the many detailed publications available on soils, soil life and soil management. These can be used to develop a deeper understanding of the subject. com'. see the Bibliography for details of these publications.

Specific conditions are required to produce effective compost teas, particularly regarding aeration. Aerobically brewed teas are the best understood and are most commonly produced and used by growers. These require careful management to ensure that the tea is well aerated to support the growth of desirable microbe species. It is easy to produce anaerobic conditions, the results of which are not fully understood and include the risk of brewing harmful organisms. Growers interested in compost tea should initially consult an expert or read up on the subject, to maximise their chance of success and minimise any hazard.

While most nutrients are required throughout the growing season, it is no surprise that the peak demand occurs during periods of active shoot and/or root growth. An example of the changes in nutrient demand over time can be seen in Table 5-3, which shows the relative uptake of specific nutrients by vines during different growth stages. The values in Table 5-3 would vary for different climatic regions. The proportion of nutrient uptake occurring between harvest and leaf-fall for example, would likely be greater in tropical/subtropical regions where foliage is retained for longer after harvest, and lower or even negligible in cold regions where defoliation occurs soon after harvest.

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