English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Use of sewage sludge compost (SSC) on agricultural soils has been proposed to alleviate problems associated with disposal of this material. Research has demonstrated that the above practice influences weed population on crops (Niggli et al., 1990; Ozores-Hampton et al., 1996). Ozores-Hampton (1998) indicated that using immature compost reduced weed seed germination and weed growth; these reductions were attributed to both the physical effect of the mulch and the presence of phytotoxic compounds. Roe et al. (1993) observed that mature municipal solid waste compost reduced weed growth in alleyways of bell pepper, but herbicides were still more effective. In Puerto Rico there are ongoing efforts to develop appropriate methods to dispose of SSC in agricultural soils (Martinez et al., 1999). Therefore, possible effects of SSC on weeds should be evaluated in agricultural systems. Data on the determination of the effect of SSC on weeds are limited. The objective of this study was to evaluate the effect of SSC application on weed density under field conditions. Field experiments with cassava were established at the Agricultural Experiment Stations in Corozal and Juana Díaz in 1996,1997 and 1998 to study the effect of SSC on weed density. A crop simulation study was also conducted at Juana Díaz in 1999. The Corozal site is located 195 m above sea level and has an Ultisol soil (Corozal clay-Aquic Haplohumults). The site at Juana Díaz is 30 m above sea level and has a Mollisol soil (San Antón loam-Cumulic Haplustolls). The experimental plots were 8.5 by 9.1 m with 1.5 m between rows. Five experimental treatments were evaluated by using a randomized complete block design (RCBD) with four replications. Treatments were rates of compost (SSC): 0, 37, 74, and 148 t/ha. These compost rates were applied annually for a three-year period. In addition, a treatment consisting of a single application of 445 t/ha of SSC (applied in 1996) was included to evaluate the effect of single versus continuous application of compost. Results of the cassava experiments here presented pertain to the second and third years after the initial application. The sewage sludge compost used was obtained from the Solid Waste Management Authority compost facility in Arecibo. Compost was applied uniformly to the experimental plots with a front load tractor; then it was incorporated in the first 15 cm of soil. During the three-year period at Corozal, ametryn at 4.48 kg ai/ha was applied three days

WEED INCIDENCE AFTER APPLICATION OF SEWAGE SLUDGE COMPOST