CO NTH NTS. 



Page. 



Introduction 7 



PrevioiKs work 7 



On the influence of carbonate of lime on the growth of plants 7 



On the influence of carbonate of lime on the ash composition of plants 8 



Plan of the investigation 12 



Materials and methods employed ll! 



Growth and composition of various plants on the calcareous and noncalcareous 



soils 15 



Bush beans 15 



Soy beans 18 



Sunflowers 19 



Radishes 22 



Sugar cane 25 



Sweet cassava 26 



Upland rice 29 



General summary of experimental results 33 



The effect of carbonate of lime on the growth of plants 33 



The effect of carbonate of lime on the ash composition of plants 34 



The effect on growth compared with the effect on ash composition 37 



Discussion of results 38 



Summary 44 



ILLUSTRATIONS. 



Page. 



Plate I. Arrangement of plats on which plants were grown 12 



II. Fig. 1. — Sweet cassava grown with no lime, Plat I. Fig. 2, — Sweet 



cassava grown with 5 per cent lime, Plat II 12 



III. Fig. 1. — Sweet cassava grown with 18 per cent lime, Plat III. Fig. 



2. — Sweet cassava grown with 35 per cent lime. Plat IV 21 



IV. Fig. 1. — Rice grown without lime. Plat I. Fig. 2. — Rice grown with 

 5 per cent lime, Plat II. Fig. 3. — Rice grown with 18 per cent lime, 

 Plat III. Fig. 4. — Rice grown with 35 per cent lime, Plat IV. ... 24 



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