. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 142 Bulletin 244. Sections i and 4 were on land which had been growing beets for the last three years 1902, 1903, 1904; in 1903 the beets suffered from leaf-spot but yielded at the rate of 17 tons per acre. Sections 7 and 10 were in corn in 1903. So far as could be judged, the plants on all sections had a uni- form start, but those on sections i and 4 soon showed signs of disease and this, with the attack of the flea-beetl
. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 142 Bulletin 244. Sections i and 4 were on land which had been growing beets for the last three years 1902, 1903, 1904; in 1903 the beets suffered from leaf-spot but yielded at the rate of 17 tons per acre. Sections 7 and 10 were in corn in 1903. So far as could be judged, the plants on all sections had a uni- form start, but those on sections i and 4 soon showed signs of disease and this, with the attack of the flea-beetles, killed many of them or injured them so seriously that the filling in of the blank spaces was almost a second sowing. The plants on section 7 grew vigorously and got ahead of the flea-beetle attack. The same was true of those on Plat 10. The results were as follows: YIELD OF FIVE VARIETIES OF MANGELS WITH AND WITHOUT ROTATION. Total yield per acre, tons. Dry matter per acre, tons Average, sections i^and 4, »i no 1 rotation. Average, section Gain tons. 24 3 Taking the variety Norbiton Giant, which occurred in all four plats, we find that the results are: YIELD OF ONE VARIETY WITH AND WITHOUT ROTATION. Total yield per acre, tons. Dry matter per acre, tons Average, sections ' I'and 4,' no rotation. Average, sections 7 and 10, 'rotation. 35-1 Gain tons. 25 If we regard the land as fairly uniform, then this would indicate that there is a distinct gain in the rotation of crops, from its influence as an agent in restricting the spread of diseases. Results with leaf-spot in sugar-beets: In 1904 the leaf-spot disease began its ravages the first week of September and spread rapidly for a few days on the plat which had been in beets without rotation. It was observed that the part which had been under rotation was almost free from leaf-spot and this led to the determination to ascertain its influence. It was presumed that. Please note that these images
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