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<br />I <br />,I <br />I <br />I <br /> <br />1880 <br />elevation which isothermal lines on Plates 3.1 through 3.4 generally <br />confirm. However, this relationship can be influenced by <br /> <br />microclimatic factors such as air flow which impact temperature <br /> <br />conditions on a local basis. <br /> <br />I <br />, <br />I <br /> <br />Aspect will also significantly affect plant growth and yield <br />potential. Much of the land in the reservation area is hilly to <br /> <br />mountainous. Aspect is the general direction of the land slope in a <br /> <br />given area. North slopes are usually cooler and moister than south <br />slopes in the same general area and with the same elevation and may <br />provide climatic niches where plants may do much better or much <br /> <br />poorer than would be expected otherwise. <br /> <br />I <br />I <br />t <br />. <br /> <br />3.3 PRECIPITATION <br /> <br />I <br /> <br />The supply of water available for plant growth, whether from rainfall <br /> <br />or irrigation, is another determining factor in evaluating crop <br />suitability and yield. Water is necessary for all plant chemical <br /> <br />processes. Further, soil nutrients must be dissolved in water to <br /> <br />allow uptake by plant roots. Water avai labi 1 i ty di rectly <br />influences the capability of agricultural crops to grow and produce <br />economic yields. <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />Water enters plants through the root system and exits from the leaf <br />surface in vapor form. This transpirational loss occurs largely <br />through leaf surface structures called stomata. Stomata maintain <br /> <br />3- 18 <br />