A key component in raising American corn yields in recent decades, nitrogen fertilizer, is more expensive in Africa than in the United States, Lynch says.
几十年来，美国玉米产量提高的关键是氮肥的利用，该肥在非洲的使用成本远比在美国的要高得多，林奇表示。
2
They are used as fertilizer in New Zealand and as a component of soups and soy sauce in Japan.
它们在纽西兰被当作肥料，在日本则是汤料和酱油成分。
3
Panicle fertilizer obviously enhanced crude protein content of matured rice grain, but the impact on the relative content of each component was not significant.