Significant amounts of nitrates are adsorbed in some Oxisols by clay layers below the depths that most crop root systems can reach.
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Q19: Which if the following is true about
Q20: Which of the following has NOT been
Q21: More than 75% of the potentially arable
Q22: Increasing per hectare yields of crops will
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Q25: In the past 25 years,population pressures have
Q26: Conservation tillage systems can decrease soil erosion
Q27: Alfisols are of greater importance in semi-arid
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Q29: Global warming will likely be curtailed if
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