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Marshall owns a 5-hectare wheat cropland. In 1973, his total crop yield was 19 tons. After using N ...

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Marshall owns a 5-hectare wheat cropland. In 1973, his total crop yield was 19 tons. After using N ...

Marshall owns a 5-hectare wheat cropland. In 1973, his total crop yield was 19 tons. After using N fertilizers for the next ten years, the total crop yield doubled. However, in spite of increasing the N fertilizer use, the total crop yield declined to 26 tons between 1983 and 2000. Which of the following would have led to the decrease in crop yield over the years?

▸ increase in nutrient use efficiency of wheat

▸ increase in fertilizer use faster than wheat yield

▸ increase in wheat yield faster than fertilizer use

▸ decrease in the quantity of applied nutrient in the soil

Textbook

Soil Fertility and Fertilizers

Edition: 8^th

Authors: Havlin, Tisdale, Nelson, Beaton

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