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Yield and Nitrogen Yield of Sorghum Intercropped with Nodulating and Nonnodulating Soybeans 1
Author(s) -
Elmore R. W.,
Jackobs J. A.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800050007x
Subject(s) - sorghum , loam , agronomy , yield (engineering) , biology , field experiment , monoculture , cultivar , nitrogen , chemistry , soil water , ecology , materials science , organic chemistry , metallurgy
Nitrogen transfer between intercropped legumes and nonlegumes has not been consistently documented. However, N transfer between mixtures of nodulating (Rj 1 ) and nonnodulating (rj 1 ) soybeans ( Glycine max (L.) Merr.) has been shown. A 2‐yr field study was conducted to examine the effects of intercropped nodulating and nonnodulating soybeans on sorghum [ Sorghum bicolor (L.) Moench] yield and N yield, and N transfer. In both years, the soybean cultivar (cv.) Clark 63 (Rj 1 ) and its rj 1 isoline, L73‐1054, were planted at different distances between sorghum (‘DeKalb BR45+’) rows. Nitrogen rate was either 0 to 100 kg N/ha in 1979 and either 0 or 175 kg N/ha in 1980. The soil was a Cisne silt loam (mesic Mollic Albaqw in both years. Monocultures of both crops were also planted in both years. Sorghum N yield was 9% greater with Rj 1 than with rj 1 in 1979. This was due to increased N yield of sorghum associated with Rj 1 in 0.4 m rows; soybean cv. had no effect on sorghum N yield in 0.8 m rows. Sorghum yield was not affected by soybean cv. Yields and competition of rj 1 soybeans in 1980 were severely reduced by the hotdry growing season confounding N‐accumulation differences between rj 1 and Rj 1 . However, from the 1979 results, we conclude that sorghum N accumulation was increased by association with Rj 1 soybeans through N transfer, and that closer proximity of sorghum and soybeans enhanced this beneficial effect.