146 STORRS AGRICULTURAL EXPERIMENT STATION. 



SUMMARY AND GENERAL DEDUCTIONS. 



The Special nitrogen experiments here reported ivere made ivith 

 corn, cow peas, and soy beans. The purpose of the experiments 

 is twofold: first, to study the effects 2ip07i the yields of the crops 

 when differeytt ki?ids and quantities of 7iitrogenous fertilizers are 

 used in addition to uniform quantities of mineral fertilizers; ajid 

 second, to study the effect of the nitrogen in the fertilizers upon the 

 percentage and amou7it of protein in the crops. 



The experij7ients with corii indicate that while the mineral fer- 

 tilizers ivere very essential to the cor 71 crop, they 2ve7-e 7iot sufficie7it 

 for this crop or this soil whe)i used alo7ie. A co77iplete fertilizer 

 with 7iitroge7i, phosphoric acid a7id potash was esse7itial for good 

 yields of co7'7i. Whe7i the yields alo7ie are co7iside7'ed , the i7iost 

 profitable results fina7icially have bee7i obtai7ied with 2^ to ^o 

 pou7ids of 7iitroge7i per acre (i7i 7iit7'ate of soda) Jised i7i co7i7iectio7i 

 with 77ii7ieral fertilizers . Whe7i the feedi7ig value of the crop is 

 C07isidered eve7i larger quantities of nitroge7i than ^o pounds per 

 acre see77i to give profitable 7-etu7-7is. While the yields of d7y 

 matter have 7iot ge7ierally bee7i 77i7ich i7ic7'eased by a7i i7icrease of 

 nit7-ogen beyo7id §0 poinids per acre, the pe7'ce7itages of 7iitroge7i 

 a7id of p7''otei7i i7i both the grai/i a7id the stover have bee7i highest 

 i7i the crops where the largest quayitities of 7iitroge7i have bee7i 

 used 171 the fertilizers. 



The experi7/ie7its ivith legu77ies — cow peas a7id soy bea7is — i7idi- 

 cate that mi7ie7-al fertilizers are of great value i7i i7icreasing the 

 yields of these c7-ops, zvhile 7iitroge7ious fertilizers do 7iot greatly 

 i7ic7'ease either the yield or the perce7itage of p7-otei7i i7i the crop 

 over that obtai7ied fvm the I7ii7ie7-al fertilizers 07ily. hi the ex- 

 periments thus far made by the Statio7i the average results with 

 coiv pea fodder shozu p7'actically no advantage f'om the 2ise of 

 7iit7-oge7ious fertilizers, hi the experime7its with soy bea7is g7'0JV7i 

 for seed so77ie i7icrease see7ns to have resulted f7'077i the use of 7ii- 

 trogenous fertilize7-s , although that i7icrease ivas small. The per- 

 ce7itages a7id yields of protei7i i7i these legu7/ies bore very little 

 7'elatio7i to the qua7itities of 7iitroge7i used, the protei7i bei7ig 171- 

 creased but little if a7iy by the use of 7iitroge7ious fertilizers. 



