Author: Marjorie Louise TownsendPublisher:
ISBN:
Category :
Languages : en
Pages : 350
Book Description
Hairy vetch (Vicea villosa Roth) and medium red clover (Trifolium pratense L.) were overseeded into corn (Zea mays L.) after the last cultivation. A high and a low seeding rate were used of each cover crop. Yields of corn and dry matter production of cover crops were measured in the cover crop establishment year. Corn was removed in some treatments to simulate silage harvest. Cover crop dry matter was again measured the following spring. Precipitation was below the long term average in all site years; about 83% of average 1993, and about 67% in 1994, and greatly influenced corn and cover crop yields. There were no significant differences in any site years between the corn yields of the four different cover crop treatments. Although there were often differences in cover crop dry matter production in October of the establishment year, there were never differences in the corn yields associated with the different cover crop treatments. Both hairy vetch seeding rates yielded more dry matter and nitrogen than both clover seeding rates. The high vetch seeding rate generally yielded more than the low vetch seeding rate in the fall of the establishment year, but there was no difference the following spring. There was generally no difference in dry matter production between the red clover seeding rates in the fall, but the high clover seeding rate yielded more than the low clover seeding rate the following spring. Cover crop spring dry matter yields were higher where corn had been removed the previous fall to simulate silage harvest than where corn had been harvested for grain. In the second year, corn was no till planted into killed cover crop residue, and corn yields measured in the fall of the second year. The cover crops apparently depleted soil moisture before corn planting, and exacerbated continuing low soil moisture levels. Corn yields in all cover crop treatments were very low at Hoytville, both when fertilizer nitrogen (FN) was added and when it was not. When no FN was added, corn yields at S. Charleston were lowest when corn was planted into vetch residue. When FN was added, corn yields were highest in the vetch treatments.
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