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Rhizoma peanut responses to fertilizer treatments on a Louisiana Coastal Plain soil
- Mooso, G.D., Pitman, W.D., Morrison, D.G.
- Journal of plant nutrition 1995 v.18 no.11 pp. 2273-2279
- Arachis glabrata, phosphorus, potassium, magnesium, sulfur, boron, nutrient availability, soil fertility, crop yield, coastal plain soils, forage, sandy loam soils, application rate, Louisiana
- Responses of rhizoma perennial peanut (Arachis glabrata Benth.) to rates of phosphorus (P), potassium (K), and a commercial product containing K, magnesium (Mg), sulfur (S), and boron (B) were evaluated on a Louisiana Coastal Plain soil. Although even the highest rate of P failed to maintain the initial high level of soil P, no response in forage production to P fertilization was obtained. Annual forage production with K fertilization of 75 or 150 kg/ha/yr averaged 7,470 kg/ha compared to 6,100 kg/ha of forage for the control. Although yields were similar at the above two rates of K, the 150 kg/ha/yr rate maintained the initial soil K level, while the 75 kg/ha/yr rate resulted in a decrease in soil K from 40 to 30 mg/kg over three years. Lack of a response to the commercial product containing Mg, S, and B at 110 or 220 kg/ha/yr of product indicated that soil levels of these nutrients were adequate for rhizome peanut under the conditions of this experiment. Unexplained, non-treatment differences in soil Ca and pH among plots produced negative correlations with forage yield, suggesting possible sensitivity of rhizome peanut to reduction in availability of a micronutrient with increasing pH. Under the relatively fertile conditions of this 3-year field experiment, rhizome perennial peanut produced positive yield responses to K fertilization at 75 and 150 kg/ha/yr, but forage production was not increased by P or a source of Mg, S, and B.