SUMMARYTwelve phosphate-solubilising organisms were isolated from t h e rhizosphere of four c u l t i v a t e d legumes growing in four soil regions of India. These organisms were identified as Bacillus megaterium, B. subtilis, B. brevis, B. pulvi/aciem, B. pumilus a n d B. polymyxa. All t h e organisms except B. megaterium a n d one s t r a i n of B. pulvi/aciens solubilised significantly greater a m o u n t s of tricalcium p h o s p h a t e over u n i n o c u l a t e d control in liquid m e d i u m .Rhizospheres of Tri/olium alezandrinum a n d Phaseolus aureus a p p e a r to provide more suitable e n v i r o n m e n t for p h o s p h a t e -d i s s o l v i n g organisms t h a n those of Crotalaria ]uncea a n d Sesbania aculeala.
Residual effect of crop residues along with green manure, microbial culture and inorganic fertilizer on yield and soil properties of wheat grown after rice were studied. The following treatments such as control, straw burn (5 t ha -1 ) , straw incorporation (5 t ha -1 ), straw (5 t ha -1 ) + 25% N of recommended dose , straw (5 t ha -1 ) + green manure (5 t ha -1 ) and straw (5 t ha -1 ) + microbial culture (a cocktail of Aspergillus, Trichoderma, Pleurotus and Phanerochaete) were imposed on rice and their residual effects on the yield of wheat and nutrients content in soils were evaluated. Results showed that application of straw (5 t ha -1 ) + green manure (5 t ha -1 ) recorded the highest yield of wheat followed by the straw (5 t ha -1 ) + 25%N of recommended dose > straw (5 t ha -1 ) + microbial culture > straw incorporation (5 t ha -1 ) > straw burn (5 t ha -1 ) > control. Availability of soil nutrients particularly N, P, K and organic carbon also increased following the above trend.
PI-iusrcA~ data concerning the I'-P bond, even in very simple systems, are scarce. From some detailed mass spectrc scopic studies of both phosphorus tri-iodide and diphosphorus tetraiodide,l an estimate of the strength of the P-P bclnd may be made. Relevant results are shown in the cycles :
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