Nitrogen for plant nutrition is mainly obtained from three sources: nitrogen-fixing plant, rain water and manure.

氮素是植物必要的营养元素之一，其主要来源有：生物固氮作用、降雨和灌溉水以及人工施肥。

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It was stated that breeding for zinc dense crop varieties with agronomic advantages was just as important for plant nutrition as for human nutrition.

评述了富锌植物的农业优势及改善人类锌营养的潜力。

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So partially enclosed sterile method can be used in the research of plant organic nutrition for its superiority and feasibility.

因此，在植物有机营养研究中采用局部无菌培养方法是可行的。

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Professor Asis Datta, director of the National Centre for Plant Genome Research, says more crops with enhanced nutrition are needed - and he believes industry will not provide them.

BBC: NEWS | Science/Nature | India unveils six-year GM plan