None regularly looks at tropical crops.

没有一个试验定期地研究热带作物。

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A bacterial leaf spot on Clausena lansium(Lour)Skeels was observed at the cam- pus of South China College of Tropical Crops in recent years.

近年来，华南热带作物学院校园内的黄皮树叶片发生一种细菌性叶斑病。

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Yunkai Great Mountain is located in the Southern fringe of south subtropical zone. There is enough heat for planting subtropical crops but not for tropical crops.

云开大山位于南亚热带南缘，种植亚热带作物热量有余，种热带作物常常不能安全越冬。

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Already the largest producer in the world of soy and beef, it has the capacity to adapt more crops to its tropical soils and develop its vast land frontier.

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But even if their fields were untouched, growers of tropical fruit and vegetables key crops in the government's efforts to wean farmers off coca-growing have often seen their roads to market washed away.

ECONOMIST: The season of El Niño | The

Still, by now, in the big coca-growing area the tropical Chapare region, inland from the Andes three times as much land is used for these crops as for coca.

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