Utomo, Muhajir and Frye, W W and Blevins, R L (1990) Sustaining Soil Nitrogen for Corn Using Hairy Vetch Cover Crop. Agronomy Journal, 82 (5). pp. 979-983. ISSN 1435-0645

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Abstract

Nitrogen fertility management is often complicated by inadequate supply, low efficiency, high losses, and the potential of polluting water resources. This study was conducted in 1984 and 1985 on a Maury soil (fine, mixed, mesic Typic Paleudalfs) in Kentucky to determine the role of a hairy vetch (Vicia villosa Roth) cover crop in sustaining soil N for corn (Zea mays L.) under no-tillage and conventional tillage. Winter cover treatments of hairy vetch, rye (Secale cereal L.), and corn residue were combined factorially with N rates of 0, 85, and 170 kg ha−1 in the two tillage systems. Total soil C and N in the 0- to 7.5-cm depth, averaged across treatments and sampling dates, were 21.8 and 2.07 g kg−1, respectively, in no-tillage and 16.6 and 1.70 g kg−1 in conventional tillage. Values were 19.8 and 1.99 g kg−1, respectively, with hairy vetch and 18.8 and 1.80 g kg−1 with rye. Conventional tillage caused rapid mineralization of soil N, as indicated by greater inorganic N approximately 6 wk after plowing. Nitrate apparently leached deeper into the soil under no-tillage than conventional tillage. Grain yield without N on the vetch treatment was essentially equal to yields with 170 kg N ha−1 on the rye or corn residue treatments—6.75, 6.75, and 6.65 Mg ha−1, respectively. Grain yield with vetch and 170 kg N ha−1 was 7.85 Mg ha−1. Although vetch provided a substantial amount of N, results suggested that to obtain optimum corn yields N fertilization should be reduced little, if any, with a vetch cover crop. Vetch appeared to add grain yield instead of reduce the need for N fertilizer.

Item Type:	Article
Subjects:	S Agriculture > S Agriculture (General)
Divisions:	Fakultas Pertanian (FP) > Prodi Ilmu Tanah
Depositing User:	MUHAJIR UT
Date Deposited:	03 Nov 2016 04:34
Last Modified:	04 Nov 2016 03:24
URI:	http://repository.lppm.unila.ac.id/id/eprint/332

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