4Moore J A, Gamroth M J. Calculating the fertilizer value of manure form livestock operations [ R ]. Oregon State University Administrative Services A442 EC1094,1993 : 1 - 7.
5Pullen D W M,Godwin R J, Grundon P, et al. Injecting bio solids into grass and arable crops, part I :design and evaluation of a shallow injector[ J ]. Biosystems Engineering, 2004,87 ( 3 ) : 285 - 297.
6Chen Y. A liquid manure injection tool adapted to different soil conditions [ J]. Transactions of the ASAE ,2002,45 (6) :1729 -1756.
7Chen Y, Znang Q, Petkau D S. Evaluation of different techniques for liquid manure application on grassland [ J]. Applied Engineering in Agriculture ,2001,17 ( 4 ) :489 - 496.
8Rodhe L, Rydberg T, Ggbresenbet G. The influence of shallow injector design on ammonia emissions and draught requirement under different soil conditions [ J ]. Biosystents Engineering, 2004,89 ( 2 ) : 237 - 251.
9Nyord T, Kristensen E F, Munkholm L J. Design of a slurry injector for use in a growing cereal crop [ J]. Soil And Tillage Research, 2010,10 ( 7 ) : 26 - 35.
