Preliminary greenhouse studies of the influence of nitrogen fertilization of peanuts on nodulation, yield, and gynophore absorption of this element
1948
Thornton, G.D. | Broadbent, F.E.
Two greenhouse experiments were conducted with peanuts; first, to determine the effects of nitrogen fertilization on inoculated peanuts growing in a nitrogen-deficient soil and, secondly, to employ isotopic nitrogen as a means of studying nitrogen absorption through peanut gynophores when varying nitrogen levels exist in the rooting zone. Nitrogen applied at the time of planting greatly reduced nodulation on peanut seedlings with a concurrent increase in nitrogen content. The combined yield of vines and nuts was increased as a result of nitrogen fertilization, except when a light application was made, weeks after planting. Six and 12 ppm of nitrogen applied either at planting or 5 weeks after planting resulted in a slightly higher percentage of mature nuts at harvest time; whereas, an excess of combined nitrogen retarded maturity. The absorption of nitrogen by peanut gynophores is established through the use of isotopic nitrogen. There is a definite correlation between the amount of nitrogen taken in through the gynophores and the available nitrogen supply in the rooting zone. When there is an ample supply of nitrogen in the rooting zone either from inoculation or a combined source, absorption through the gynophores is negligible; whereas, when a near nitrogen starvation level exists in the rooting medium considerable absorption takes place through the gynophores.
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