Container Nursery Stock Response to Recirculated Nutrients

Gils, Juami H. M. van; Chong, Charing Ching Ning; Lumis, G. P.

doi:10.17660/actahortic.2004.630.27

Cited by 2 publications

(1 citation statement)

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“…While the compost-based substrate per se may have contributed extra amounts of nutrients such as NH 4 -N, K, Ca, and Mg (Table 1), their contribution to overall plant growth is perhaps very minimal and occurred primarily during a relatively brief period after potting. Results from previous studies under similar cultural conditions indicate that (a) the soluble salts in a wide variety of compost-based media have typically declined by as much as 80% within days after potting (Chong, 1999a), and (b) this 1:1 by volume compost; bark medium has a relatively high (40%-50%) leaching fraction (Gils et al, 2003) and is quite porous (total porosity, 60% ± 1%; aeration porosity, 33% ± 1%; water retention capacity, 27% ± 1%; bulk density, 0.37 ± 0.01 g cm -3 ). During most of the study period, rainfall of 58, 67, 74, and 30 mm in July, August, September, and October, respectively, was close to the long-term (65year) averages of 65, 77, 76, and 58 mm for the same months.…”

Section: Resultsmentioning

confidence: 90%

Growth and Nutrient Status of Six Species of Nursery Stock Grown in a Compost-based Medium with Recycled Nutrients

Chong¹,

Lumis²,

Purvis³

et al. 2004

HortSci

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Rooted cuttings of `Antonovka' apple, `Lynwood Gold' forsythia, double-flowered kerria, common ninebark, `Goldfinger' potentilla, and `Red Prince' weigela were grown in 2-gal (6-L) nursery containers filled with 1:1 (by volume) of waste compost and composted pine bark, under three fertilizer regimes: 1) liquid nutrients [target concentrations in ppm (mg.L-1): NH4-N, 13; NO3-N, 100; P, 28; K, 120; Ca, 92; Mg, 13; Fe, 1.3; Mn, 0.27; Zn, 0.23; Cu, 0.05; B, 0.22; Mo, 0.05; Na, <50; Cl, <50; and SO4 <300] delivered and recycled twice per day via a computer-controlled multifertilizer injector; 2) same nutrient formula and concentration rate delivered fresh via the injector but without recycling; and 3) Nutryon (Polyon) 17-5-12 controlled-release fertilizer incorporated into the medium at a rate of 11 lb/yd3 (6.5 kg·m-3). With recycled liquid nutrients, all species grew the same or more than with nonrecycled nutrients, and generally the poorest growth was with controlled-release fertilizer. Foliar concentrations of K (all species), N (all species), P (forsythia, kerria, potentilla, and weigela), and Mn (forsythia, potentilla, and weigela) were higher in plants supplied with recycled and/or nonrecycled nutrients than in those supplied with controlled-release fertilizer, while foliar concentrations of Ca (ninebark and kerria) and Mg (apple, kerria, ninebark, potentilla, and weigela) were lower. Compared to nonrecycled liquid nutrients, the amounts of individual recycled nutrients were reduced by (percentage in brackets): NH4-N (30), NO3-N (78), P (76), K (46), Ca (93), Mg (96), Fe (52), Mn (43), Zn (55), Cu (60), B (83), and Mo (66).

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Section: Resultsmentioning

confidence: 90%