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<br />q- <br />M <br />en <br />N <br />o <br />o <br /> <br /> <br />But once we know that seepage and <br />overirrigation are undoubtedly the problem, <br />there is much we can do, By knowing the <br />soils, by knowing the water needs of the <br />plants growing in them, by knowing the <br />temperatures and relative humidities of the <br />days of the season, we can calculate just how <br />much water to put on the soils to make the <br />plants grow without raising the water table. <br />We can - and have -- designed new <br />irrigation systems that apply the water only <br />to the plants we want to nurture and not to <br />all the weeds and soil between. <br /> <br /> <br />16 <br />