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Vergara - 1976 - Physiological and morphological adaptability of ri

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CIJMATTZ AND CROP PROI)LI(TI"IVI'I'Y IN AUSTRALIA 50L<br />

we need to subdivide the system into components which are known to control<br />

the performance <strong>of</strong> the system. At the most general level. for example. we might<br />

envisage a crop production system as having the components shown in Figure 2.<br />

Any comprehensive model <strong>of</strong> a crop-production system should include the<br />

harvesting. processing, <strong>and</strong> marketing-consumption components because <strong>of</strong><br />

very important feedback mechanisms. Of course, component processes <strong>and</strong><br />

IIOLOGlCAI. PRODUCTION<br />

TECHNOLOGY:<br />

ENERGY INPUTS<br />

MATERIAL INPUTS<br />

MANAGEMENT STRATEGIES<br />

GENETIC MANIPULATION<br />

ll<br />

i<br />

PHYSTCAL ENVIRONMENT stonc envmomeur<br />

ENERGY<br />

WATER<br />

CKRBQN<br />

MINERAL NUTRTENTS<br />

ll<br />

PESTS<br />

DISEASES<br />

PARASITES<br />

COMPETLTOQS<br />

osnorvrs:<br />

PROGRAMMES! FULES FOR<br />

GFTOWTH<br />

AND<br />

DEVELOPMENT<br />

TOTAL<br />

BIOLOGICAL YIELD<br />

I<br />

l<br />

ECONOMIC<br />

YIELD<br />

HARVESTING<br />

l<br />

' SYSTEM LOSSES<br />

SOIL<br />

HARVESTED YIELD wAfig<br />

l<br />

1<br />

|<br />

NUTRIENTS<br />

PROCESSING l i<br />

I<br />

PROCESSED PRODUCTl5!<br />

HARVEST LOSSES<br />

__l<br />

MARKETING mo l<br />

CONSUMPTION i<br />

CON SUMED<br />

PRODUCT [S]<br />

l<br />

PROCESSLNG L<br />

s<br />

2. Schematic presentation <strong>of</strong> major components <strong>of</strong> a crop production system.

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