33 



The percentage of magnesia in the ash is higher in the plants from 

 the lime plats than in the check plants in all the crops. The phos- 

 phoric acid, potash, and nitrogen show great irregularitj^, the plants 

 from the lime plats being sometimes much higher and sometimes much 

 lower in these elements than the check plants. 



GENERAL SUMMARY OF EXPERIMENTAL RESULTS. 



THE EFFECT OF CARBONATE OF LIME OX THE <;Rf)WTH OF PLANTS. 



The average relative growths of all the plants on the four plats are 

 shown in Table XXVI. 



Table XXVI. — Arcmr/r rrlatire ffroiiihs vinde nn tlif pints hy tlie diffcrnit plants. 

 [1 irowtli made on Plat 1= lon.] 



62±5 

 38±6 

 o3±5 



^Vf tcr making allowance for the probable error of the average results, 

 it appears that the growth of bush beans and radishes was certainly 

 not depressed on- the calcareous soils, but possibly shghtly increased. 

 Soy beans, sunflowei-s, and sugar cane were little affected in their 

 growth by the calcareous soils of Plats II and IV, but on Plat III 

 their growth was unmistakably diminished, the decreases being four 

 to nine times the probable error. The growth of sweet cassava was 

 sUghtly decreased on the moderately calcareous soil of Plat II (PI. 

 II, fig. 2) and strongly decreased on the more limy soils of Plats III 

 and 1\ (PI. III). The growth of rice was greatly depressed on aU 

 the hme plats (PI. IV). In brief then, the tolerance of the plants 

 for the different amomits of carbonate of hme was as follows : Bush 

 beans and racHshes were unaffected even by 35 per cent of CaCOj; 

 sunflowers, soy beans, and sugar cane wore somewhat affected by 18 

 per cent of CaCOg ; sweet cassava was somewhat affected by 5 per 

 cent of CaCOg and markedly by 35 per cent; rice and pineapples 

 were greatly affected by 5, 18, and 35 per cent of CaCOj. 



Rice and pineapples were the only plants that became chlorotic 

 on the calcareous soils, although the other plants whose growth was 

 but httle affected were often a somewhat Ughter green on the lime 

 plats than on the check. In the case of soy beans, sunflowere, sugar 

 cane, and rice it -ftdll be noted that the greatest depression in growth 

 occurred on Plat III, with 18 per cent of CaGOj rather than on Plat 

 IV Avith 35 per cent of CaCOj. As mentioned on page 13. Plat IV, 



