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Corn zea mays response to nitrapyrin and nitrogen application methods on sandy coastal plain soils



Corn zea mays response to nitrapyrin and nitrogen application methods on sandy coastal plain soils



Journal of Fertilizer Issues 1(1): 7-14



Leaching losses frequently reduce the efficiency of N-fertilizers on the sandy kaolinitic soils of the Southeastern Coastal Plains [USA]. Splitting N applications is 1 method of improving efficiency but an alternative management practice could be use of a nitrification inhibitor. Effects of nitrapyrin and 2 methods of N-application were evaluated on corn (Z. mays L.) yields, plant height, tissue-N, and kernel moistures on 4 Paleudult soils at 3 locations during 1981 and 1982. A 32% UAN [urea ammonium nitrate] N-Source was applied at either 150 lb N/acre at preplant (PP) or 50 lb N/acre PP plus 100 lb N/acre sidedressed (SD) .apprx. 60 days after planting. Whole plot treatments (methods) were split with or without (0.5 lb active ingredient/acre) nitrapyrin [2-chloro-6-(trichloromethyl)pyridine, N-serve](NI) at planting, and replicated 10 times in 1981 and 6 times in 1982. Data were analyzed by sites and years, and combined for multiple years per site, multiple sites per year and pooled for all years and sites. The effects of N-application method, NI, and their interaction on the plant parameters measured varied with location and years. For the pooled data, plant height was increased (P > 0.01) with NI and with N-PP compared to no NI and to N-SD, respectively. Leaf N response was not significant for NI but was increased (P > 0.01) with N-PP compared to N-SD. The interaction of NI .times. N-method on tissue N (P > 0.01) was positive for N-SD and negative for N-PP. Kernel moisture at harvest was decreased (P > 0.02) with NI and increased with N-PP compared to no NI and N-SD, respectively. Corn yields were increased (P > 0.02) with NI and decreased with N-PP compared to no NI and N-SD, respectively. N-SD is a more effecive method of applying N than N-PP; nitrapyrin can be an effective tool for improving corn yields on sandy Paleudult soils of the Southeastern Coastal Plains. The location, year and treatment interactions observed, however, reflect the complexity of the N cycle and its interaction with the environment, and as such can limit the predictability and success of either treatment.

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