FERTILIZER TESTS ON PASTURES 



Table 4. — Mean Increase Over Check, Worcester Experiments 



(Pounds dry matter per acre) 



All Experiments 1031 and 1932 Experiments 



Treatment ■ • 



1930 1931 1932 Menn W-l \V-2 VV-5 W-9 



L 529 114 202 282 176 405 164 5 



L, P 375 237 382 331 32 328 234 597 



L, P, K 830 275 814 640 341 418 362 995 



N 955 463 526 648 138 478 189 568 



L, N 824 828 826 968 933 741 744 



L, P, N 854 778 816 818 823 754 1027 



L, P, K, N 1545 1016 1114 1225 1457 615 1151 1375 



Amherst Experiment 



In Table 5 are presented the total yields of vegetation from the Amherst 

 experiment for 1931 and 1932. The results are quite similar to those obtained 

 from this experiment in 1929 and 1930 (Experiment C, Bulletin 281) with the 

 following exceptions. Nitrogen alone was more effective than any other single 

 element, but did not produce as much as the best combination of minerals. 

 This improvement in the relative position of nitrogen in the last two years as 

 compared with the first two, is probably due to cumulative effects of the sodium 

 nitrate. Aside from any possible cumulative effect of nitrogen itself, there is a 

 cumulati\e benefit due to the toxic effect of sodium nitrate on haircap moss, and 

 probably a cumulative effect of sodium on the availability of phosphorus. These 

 effects are discussed later. 



Table 5. — Total Yield from the Amherst Pasture Experiment 



(Pounds dry matter per acre) 



Treatment 



No N N 



1932 



No N N 



Increase 

 Over Check 



No N N 



Increase Ratio 

 Due to 



N No N:N 



K 461 475 15.5 515 308 495 39 226 



P 1539 1434 2S5 779 912 1107 643 S3S 



1 1401 15.30 251 1090 856 1310 587 1041 



L, P 1581 1386 197 6.59 8S9 1023 620 754 



P, K 621 1138 94 544 .358 841 89 572 



L, K 1657 1485 214 920 936 1203 667 934 



L, P, K 1246 1787 267 645 757 1210 488 947 



2K 294 9S9 405 1114 .350 



2P 3.59 910 447 986 403 



2L 70() 1069 308 1184 507 



2L, 2P 835 985 839 963 837 



2P, 2K 567 1386 314 1391 441 



2L, 2K 692 936 619 1362 656 



2L. 2P, 2K.... 948 1374 778 2003 863 IISS 594 919 



3K 629 1210 283 120S 4.56 1209 187 910 



3P 424 1093 234 1040 329 1067 60 798 



3L 510 904 243 888 377 896 108 627 



3L, 3P 888 1592 230 827 559 1210 290 941 



3P, 3K 536 1158 186 533 361 846 92 .577 



3L, 3K 1069 1803 .341 1011 705 1407 436 1138 



3L, 3P, 3K 2045 2586 571 1012 1308 1799 10-39 15.30 



Check 158 1119 3S0 1167 269 1143 874 



10.52 81 783 



948 134 679 



1127 238 858 



974 .568 705 



1389 172 1120 



1149 387 880 



187 

 195 

 454 

 134 

 483 

 267 

 450 



702 

 545 

 620 

 137 

 948 

 493 



753 



.738 

 519 

 651 

 485 

 702 

 491 



874 



1:1.6 

 1:1.2 

 1:1.5 

 1:1,2 

 1:2.4 

 1:1.3 

 1:1.6 



1 -3.0 

 1:2.3 

 1:2.2 

 1:1.2 

 1:3.1 

 1:1.7 

 1:1.4 



1 :2.6 

 1:3.2 

 1:2.4 

 1:2.2 

 1 :2.3 

 1:2.0 

 1:1.4 



1:4.2 



