A method of determing moisture of soil surface layer (0-20cm) by a subsurface neutron gauge with a Li-Glass detector was introduced. A hydrogeu-rich reflector was put on the surface. The results were shown to have a good linear correlation and a reasonable deviation
therefore the technique could be used in practice.
Institute of Nuclear Agricultural Sciences, Zhejiang Agricultural University, Key Labarafory of Nuclear- Agricultural Sciences, Ministry of Agriculture