How to translate text using browser tools
7 October 2019 Fertilizer Placement Affects Growth and Reproduction of Three Common Weed Species in Pine Bark–Based Soilless Nursery Substrates
Debalina Saha, S. Christopher Marble, Nelmaris Torres, Annette Chandler
Author Affiliations +
Abstract

Weed management in container crops is primarily accomplished through frequent PRE herbicide applications and supplemental hand weeding. However, many ornamental species are sensitive to herbicides, and a significant number of tropical plants, ornamental grasses, and foliage crops have not been screened for herbicide tolerance. As nursery crops are produced in inert substrates that are largely composed of bark or peat, strategic fertilizer placement has the potential to significantly reduce weed growth in container-grown ornamentals. Growth and reproduction of three common container nursery weed species, eclipta [Eclipta prostrata (L.) L.], large crabgrass [Digitaria sanguinalis (L.) Scop.], and spotted spurge (Euphorbia maculata L.), were evaluated following fertilization via alternative methods, including subdressing or dibbling in comparison with industry standard practices of topdressing or incorporating a controlled-release fertilizer (17-5-11 [8 to 9 mo.]) to each 3.8-L container at 36.5 g per container. Fertilizer placement had little to no effect on germination of Eclipta prostrata or D. sanguinalis, but incorporation increased E. maculata germination by 77% to 183% compared with other placements or a nonfertilized control. Subdressing reduced seed production by 94%, 63%, and 92% for Eclipta prostrata, D. sanguinalis, and E. maculata, respectively, compared with the average number of seeds produced in the conventional placement methods (average of incorporation and topdressing). Dibbling fertilizer resulted in similar decreases in the case of D. sanguinalis and E. maculata, while Eclipta prostrata produced no seeds when fertilizer was dibbled. Similar to reductions observed in reproduction, subdressing fertilizer resulted in biomass decreases of 90%, 81%, and 85% compared with the average biomass of the incorporation and topdressed placements. Results suggest alternative fertilizer placements could be implemented as part of an integrated weed management program in container production to reduce weed growth.

© Weed Science Society of America, 2019.
Debalina Saha, S. Christopher Marble, Nelmaris Torres, and Annette Chandler "Fertilizer Placement Affects Growth and Reproduction of Three Common Weed Species in Pine Bark–Based Soilless Nursery Substrates," Weed Science 67(6), 682-688, (7 October 2019). https://doi.org/10.1017/wsc.2019.49
Received: 28 March 2019; Accepted: 30 August 2019; Published: 7 October 2019
KEYWORDS
container
Eclipta
Large crabgrass
nursery
ornamental
spotted spurge
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top