1 / 4   While hydrogen balloons are frequently used in parties, little attention is paid towards its practice in agriculture. However, a farmer from Huai'an City, east China's Jiangsu Province, decided to put it to good use while spraying his pesticides. /VCG Photo

2 / 4   This simple device invented by local farmer Wang Shanjun, requires controls to help move the end of the pipeline by hand, to control the spraying area. /VCG Photo

3 / 4   It can be operated only by three to four people. /VCG Photo

4 / 4   Compared with expensive unmanned aerial vehicles, it not only improves work efficiency, but also greatly saves costs and increases grain output. /VCG Photo