Biopersistence of commercial man-made vitreous fibers (MMVF) and crocidolite were studied in Fischer 344 rats. MMVF used were size-selected to be rat-respirable, and rats were exposed nose-only 6 h/day for 5 days to gravimetric concentrations (30 mg/m3) of two fiber glass compositions--a rockwool, and a slagwool--or to 10 mg/m3 of long-fibered crocidolite, or to filtered air. Animals were sacri...

Rockwool (RC) and peat are two common substrates used worldwide in horticultural crop production. In recent years environmental and ecological concerns raised the demand for reducing the use of RC and peat. Although coconut coir (CC) has been increasingly used as an alternative to RC and peat, it is still needed to comprehensively evaluate the feasibility of CC before widely used. To meet this ...

The relationship between the activity and community structure of microbes associated with the oxidation of ammonia in a full-scale rockwool biofilter was examined by kinetic, denaturing gradient gel electrophoresis (DGGE), and sequence analyses. The packing materials were sampled from two different depths at 3 sites. Estimated K(m) values were similar among depths at same sampling sites, while ...

This study aims to determine the effects of planting media and gutter slopes on growth lettuce (Lactuca sativa L.) using Nutrient Film Technique (NFT) in a hydroponic system. research was conducted at Experimental Garden Faculty Agriculture, Universitas Lakidende Unaaha, Konawe Regency, Indonesia, October 2021. The two treatments were arranged randomized block design (RBD) repeated three replic...

Abstrak. Nutrisi AB Mix merupakan campuran pupuk majemuk larut air yang mengandung sejumlah unsur hara penting untuk pertumbuhan tanaman terutama pada media tanpa tanah seperti cocopeat. Aplikasi larutan nutrisi tepatpada tersebut sangat agar dapat tumbuh dengan baik. Penelitian ini bertujuan memperoleh konsentrasi penggunaan terbaik terhadap sawi hijau cocopeat dikelola sistem hiroponik. Perco...