Abstract: This note is intended to discuss the returnable Global Positioning System (GPS) sonde (RGS). RGS, adopting the shape of an aircraft, is 700?1000 g in weight. RGS is carried up into the air by a balloon and continuously ...

Abstract: A procedure called water wiping is developed to measure the amount of water intercepted by the canopy of winter wheat under sprinkler irrigation. Macromolecule bibulous materials with high water absorption is used to collect ...