The waterlogged lowland and clay salinized land accounted for 80% of the area′s low yield farmland.

低洼涝渍田和粘闭滞渍田是渍害土壤的主要类型，约占全市低产田总面积的80％。

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This study investigated variations in soil respiration under different cultivation practices on high yield farmland in the North China Plain during 2004.

对华北平原高产农田生态系统2004年的土壤呼吸状况进行了分析，探讨了不同耕作方式下土壤呼吸量的季节变化规律。

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We will increase efforts to develop, improve and reclaim land, upgrade low - and medium-yield farmland, improve the productivity of farmland and develop farm plots that meet high standards.

加大土地开发整理复垦力度，搞好中低产田改造，提高耕地质量，建设一批高标准农田。

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Deininger and Byerlee (2011) Rising Global Interest in Farmland: Can it Yield Sustainable and Equitable Benefits?

UNESCO: TH?MES

Improvements in yield reduced the need to convert forests and other natural environments to farmland, which typically involves burning of trees and other plants, and which in turn produces carbon dioxide and other greenhouse gases.

FORBES: Magazine Article