xiii, A, 3 Mirasol y Jison: Fertilizer Experiments 



13-7 



PRESENT EXPERIMENTS 



The present experiments were carried out on a clay-loam soil 

 from which a crop of sweet potato had been harvested. The 

 land was first thoroughly plowed, and then fifteen plots of 450 

 square meters each were laid off. The Los Baiios white cane 

 was used. It had been previously found that this variety of 

 cane would yield 5.86 tons of 96° sugar per hectare.* The seeds 

 were all selected, as to size, from a field of plant cane. The 

 rows were 1.5 meters apart, and the seeds were laid 25 centi- 

 meters from end to end at the bottom of furrows 30 centimeters 

 deep. Planting began May 8, 1916, and was finished May 10, 

 1916. On May 16 the canes were nearly all above the ground. 

 On July 15 the stools in each plot were counted. The percentage 

 of success in each plot is shown in Table I. 



Table I. — Los Banos white cane planted in a clay-loam soil. 



Plot. 



Seeds 

 plant- 

 ed. 



Stools 

 count- 

 ed. 



Suc- 

 cess. 



I 

 Plot. 



Seeds 

 plant- 

 ed. 



Stools 

 count- 

 ed. 



1 

 Suc- 

 cess. 





' 





P.ct. 



1 







P.ct. 



1 



600 



483 



80 



1 9 



600 



507 



84 



2 



600 



472 



79 



1 10 



600 



529 



88 



3 



600 



405 



68 



11 



600 



469 



78 



4 



600 



496 



83 



12 



600 



602 



83 



5 



600 



499 



83 



13 



600 



544 



90 



6 



600 



433 



72 



14 



600 



517 



86 



7 



600 



547 



91 



15 



600 



433 



72 



8 



600 



458 



76 











On July 22 the fertilizers were applied. The cost of fer- 

 tilizers, as computed from the Manila prices for 1916, and their 

 composition (as determined by Doctor Deming, formerly of this 

 college) are given. 



Table II. — Composition and cost of fertilizers. 



Lime 



Dried blood, 14 per cent nitrogen 



Sulphate of ammonia, 20 per cent nitrogen 



Nitrate of soda, 15 per cent nitrogen 



Sulphate of potash, 40 per cent potash (K2O) 



Double superphosphate, 20 per cent phosphoric acid 



(P=0:,) 



Peso per kilo. 



0.02 

 0.10 

 0.23 

 0.20 

 0.23 



0.22 



Table III shows the plan and the corresponding cost of fer- 

 tilization per hectare. 



•Phil. Agr. & Forest. (1915), 4, Nos. 5-6. 



