The abundance-deficiency index of soil P and recommended phosphorus fertilizer application rates for grain and forage barley in China
To provide scientific basis for soil testing and P fertilizer recommendation of barley,an algorithm for scattered experi-mental data integration and the new applied formula based on"the methods of nutrient balance and projected yield minus soil fertility yield"were employed to study the abundance-deficiency index(ADI)of soil P and the recommended phosphorus fertil-izer application rate(RPFAR)for barley in China.The results showed that the ADI of soil available phosphorus(Olsen-P)for barley in China from the first to the eighth level were≥40.7,24.2～40.7,14.4～24.2,8.6～14.4,5.1～8.6,3.0～5.1,1.8～3.0 and<1.8 mg/kg,respectively.When the phosphorus fertilizer use efficiency in current season(PFUEICS)was 15%～35%and the target yield of grain barley was3～7.5 t/hm2,the ranges of the RPFAR for the abundance-deficiency level1～8 from high to low were 0,9～50,17～100,26～150,34～200,43～250,51～300 and 60～350 kg/hm2,respectively.When the PFUEICS was15%～35%andthetargetyieldofbarleyhaywas6～15 t/hm2,therangesofthe RPFARfortheabundance-de-ficiency level 1～8 from high to low were 0,9～50,17～100,26～150,34～200,43～250,51～300 and 60～350 kg/hm2,re-spectively.When the PFUEICS was15%～35%and the target yield of barley silage was15～45 t/hm2,the ranges of the RP-FAR for the abundance-deficiency level 1～8 from high to low were 0,7～51,15～102,22～153,29～204,36～255,44～306 and 51～357 kg/hm2,respectively.In this study,the recommended fertilization system of soil available phosphorus for grain and forage barley in China was established,and it laid a scientific foundation for soil testing and phosphorus fertilization of barley in China.
barleysoil testing and fertilizer recommendationsoil nutrientavailable phosphorusabundance-deficiency indexfertilizer application rate
NETL
NSTL
万方数据
维普
