Studies on the varietal response of soybeans to nitrogen application level under different soil acidity, 1. effects of pH and nitrogen application level on nodulation, allantoin-N and total nitrogen content of soybean plants
1988
Lee, H.S. | Kwon, O.H. (Seoul National Univ., Seoul (Korea R.). Dept. of Agronomy) | Kim, K.H. (Konkuk Univ., Seoul (Korea R.). Coll. of Agriculture)
To determine the response of soybean cultivars to nitrogen in relation to acidity, nodulation, content of allantoin nitrogen and major chemical compositions, two soybean cultivars were investigated under two levels of soil pH and four levels of nitrogen fertilization in a field and nutri-culture experiments. Nodulation and contents of allantoin nitrogen, total nitrogen, potassium, calcium, magnesium and manganese of soybean plants decreased under acidic condition, but the degree of decrease was smaller in the variety Jangbaegkong compared to the variety Danyeobkong. On the other hand, nodulation, content of allantion nitrogen and potassium decreased with increased nitrogen fertilization, particularly under pH 7 condition. Nodulation was positively correlated with the content of allantion nitrogen of soybean plants. The content of total nitrogen of soybean plants increased with increased nitrogen fertilization, and this tendency was remarkable under acidic condition and in the variety Jangbaegkong
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