Wheat used to be America's top crop, says economist Charlotte Hebebrand.

经济学家黑贝布莱德表示，小麦一直是美国的重要作物。

Last year the state yielded nearly 62 million tons of the crop-vital for livestock feed and ethanol production-making it the top U.S. grower of golden kernels.

去年该州产出近6200万吨玉米——家畜饲养和乙醇生产不可或缺的原料——使之成为美国金黄色玉米粒产量最大的州。

How to use and develop the salted soil in order to increase crop production and improve environment is one of the top projects all over the world.

如何利用和开发盐渍化土地，提高作物产量和改善生态环境是全世界面临的重大课题。

The crop is usually the country's top export earner.

农作物通常是全国最大的出口赚钱作物。

Here's a detailed look at this year's crop of top employers.

以下是排名前十的公司的详细情况。