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Titolo:
The pre-sidedress soil nitrate test and nitrate leaching from corn
Autore:
Guillard, K; Morris, TF; Kopp, KL;
Indirizzi:
Univ Connecticut, Dept Plant Sci, Storrs, CT 06269 USA Univ Connecticut Storrs CT USA 06269 Dept Plant Sci, Storrs, CT 06269 USA
Titolo Testata:
JOURNAL OF ENVIRONMENTAL QUALITY
fascicolo: 6, volume: 28, anno: 1999,
pagine: 1845 - 1852
SICI:
0047-2425(199911/12)28:6<1845:TPSNTA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN AVAILABILITY; MAIZE PRODUCTION; MANAGEMENT STRATEGIES; LABELED NITROGEN; NO-TILL; LYSIMETERS; DRAINAGE; SYSTEMS; YIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Guillard, K Univ Connecticut, Dept Plant Sci, U-67,1376 Storrs Rd, Storrs,CT 06269 USA Univ Connecticut U-67,1376 Storrs Rd Storrs CT USA 06269 9 USA
Citazione:
K. Guillard et al., "The pre-sidedress soil nitrate test and nitrate leaching from corn", J ENVIR Q, 28(6), 1999, pp. 1845-1852

Abstract

The pre-sidedress soil nitrate test (PSNT) is recommended in many states as a best management practice (BMP) for corn (Zea mays L.). A 2-yr study wasconducted in Connecticut on a Woodbridge fine sandy loam soil (coarse loamy, mixed, mesic Aquic Dystrochrept) to determine NO3-N concentrations and losses in soil water from corn managed with three different N fertilization regimes: (i) PRE, 196 kg N ha(-1) applied preplant; (ii) PSNT-1, 90 kg N ha(-1) applied at preplant and any remaining N needs estimated by the PSNT (0kg ha(-1) in 1995 and 45 kg ha(-1) in 1996); and (iii) PSNT-2, no preplantN and all N needs estimated by the PSNT (34 kg ha(-1) in 1995 and 123 kg ha(-1) in 1996). Percolate was collected with zero-tension pan lysimeters. Flow weighted NO3-N concentrations from the PRE treatment were 22.3 mg L-1 in 1995 and 17.4 mg L-1 in 1996; the PSNT treatments were <8.0 mg L-1. Losses of NO3-N as a percent of N applied in 1995 were 20%, 10%, and 12% for PRE, PSNT-1, and PSNT-2, respectively, and 31%, 21%, and 21%, respectively, in1996. Greatest leaching losses occurred after corn harvest. Corn yields were not significantly (P > 0.05) different among N treatments. These findings suggest that a well calibrated soil N test can reduce excess fertilization and the potential for NO3 contamination of ground water.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 18:12:58