For this reason, they have to depend solely upon nitrogenous compounds which are present in the soil and are soluble in water. 伯莎M.克拉克.科学通论.
The soluble nitrogenous soil compounds are absorbed by roots and are utilized by plants for food. 伯莎M.克拉克.科学通论.
Proteids always contain nitrogen, and hence they are frequently spoken of as nitrogenous foods. 伯莎M.克拉克.科学通论.
A crop of peas, beans, or clover is equivalent to nitrogenous fertilizer and helps to make ready the soil for other crops. 伯莎M.克拉克.科学通论.
Soil and the fertilizers which enrich it, the plants which grow on it, and the animals which feed on these, all contain nitrogen or nitrogenous compounds. 伯莎M.克拉克.科学通论.