Agronomy of Grassland Systems by Craig J. Pearson, Ray L. Ison

By Craig J. Pearson, Ray L. Ison

The demanding situations dealing with grassland agronomists have gotten more and more complicated, with environmental and moral matters assuming a better importance along extra traditional technical facets. This new elevated version, with an elevated emphasis on structures pondering, has been revised to mirror present issues, wisdom and perform. As such it addresses the necessity for a special method of grassland agronomy, offering novel and provocative fabric to educate, stimulate and enthuse the reader.

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Ii) Response ^ communication is reciprocal. There is here a moral obligation: to learn to understand, to pay attention, and to respond. (iii) Symmetry ^ in opposing and balancing each other, parts must be equivalent because the purpose is not to `win' or to dominate, but to block thereby producing further balance. (iv) Autonomy ^ no species, no group, or country is `boss' for another; each adheres to its own law. Authority and dependence are necessary within parts, but not between parts. So how do these values relate to our Western ideas and the direction of our design for di¡erent grassland systems in southern Australia?

But the reintroduction of deep-rooted perennial grasses into the system has the potential to act as a sink for nitrate. Scientists have now proposed two speci¢c research hypotheses for the development of sustainable grassland systems in Southern Australia: (i) that perennial grasses with a longer growing season and a deeper root system than annuals will make better use of soil water nutrients and help to maintain a productive soil structure and biota; (ii) that a sustainable pasture is one where the soil/plant/animal system combines to optimize water use and nutrient cycling and to thus minimize water and nutrient leakages from the system.

The distribution of livestock re£ects: maintain or return to. We return to this theme in Chapter ñ. g. Spedding, "ñæ"; Nestel, "ñðã). The complex and dynamic relationships between humans, animals and grasslands give rise to the di¡erent grassland systems. Increasingly our relationships with animals are determined by technologies and our theories about progress. Thus, there is a positive relationship between per capita income and beef consumption just as there is a positive relationship between saturated fat intake, by humans, and coronary heart disease.

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