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Pasture Clipping Yields

The data on the 1960 pasture clippings from the plots in the new fertilizer trial are given in Table 15. The two-year average yields from the pasture clippings are given in Table 16. It should be pointed out that there was very serious stand deterioration in the intermediate wheatgrass plots subjected to pasture clipping after only one season of clipping. Consequently, the intermediate pasture plots were not clipped in the 1960 season. So much of the stand died out in these plots that it is questionable whether they will be able to recover.

A further complicating factor in the results of the pasture clipping was that the rotary mower used in the clipping trials swept up large quantities of dust and debris, which could not be readily separated from the grass. In reporting the yields, the actual weights of yield samples were decreased by 30 per cent to allow for weight of this foreign material.

The presence of alfalfa in the mixtures resulted in increased yields over the check yields, but this increase was not great. With Nordan crested, the fertilized plots produced no more than the grass-alfalfa plots, although all fertilized plots yielded slightly better than the check plots. The same general situation prevailed with Russian wildrye, with alfalfa and all fertilized plots yielding only slightly better than the check plots. In the case of Lincoln brome, a fairly good increase in yield was obtained with the alfalfa grass mixture, but very little additional increase was obtained from the fertilizer.

As indicated by the data of Table 16, the results of the trial thus far show no substantial advantage for fertilizer over alfalfa in increasing yields of pasture-type clippings. The increases in yield obtained thus have not been economical on the basis of additional forage produced.

Table 15. Dry-weight yields* (lbs./acre) from pasture clippings of grasses alone, with alfalfa, and with three rates of nitrogen fertilizer -- 1960 season.
  Grass Alone With Alfalfa 33# N 67# N 100# N

Variety

1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total
Nordan Crested 700 270 970 841 306 1147 736 272 1008 825 231 1056 853 257 1110
Intermediate Wheatgrass Plots clipped as pasture mainly killed out.
Russian Wildrye 652 330 982 653 372 1025 700 342 1042 683 352 1035 804 469 1273
Lincoln Brome 337 251 588 507 211 718 587 248 835 813 230 1043 585 286 871
*Actual sample weight decreased by 30 per cent to allow for dust and debris swept up by rotary mower.

 

Table 16. Two-year average dry-weight yields (1959-60) from pasture-type clippings of grasses alone, with alfalfa, and with three rates of nitrogen fertilizer.
  Grass Alone With Alfalfa 33# N 67# N 100# N
Variety 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total 1st Clip 2nd Clip Total
Nordan Crested 615 265 880 853 291 1114 783 240 1023 880 277 1157 852 273 1125
Intermediate Wheatgrass

Plots clipped as pasture killed out after first year.

Russian Wildrye 468 368 836 463 400 863 566 378 944 568 407 975 624 465 1089
Lincoln Brome 369 262 631 510 248 758 524 249 773 629 250 879 579 361 940

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