Info

Shann [43] investigated the "target-neighbour" cocropping approach to determine the effect of planting density on the uptake of metal (in this case, selenium) by known accumulating (mustard) and nonaccumulating, sensitive species (tomato). If the resource for which plants are competing is a toxin or a contaminant, density should determine the amount that each individual acquires from the substrate. The concentration of metal in plant tissue may be highest for the individual at low density, but total metal found in a stand of vegetation should occur at the density where biomass is maximal. If accumulating plants are to be managed in a manner that optimises the amount of metal removed from the substrate, then this maximal biomass density needs to be determined. In addition, the cocropping of an accumulator with a sensitive species will provide information on the possibility of growing crop species with accumulators, thus minimizing the amount of metal that is taken up by an individual. This could decrease metal phytotoxicity or could limit the tissue concentration of metals to a level considered safe for consumption. Liu et al. [44] investigated a cocropping technique using a known zinc hyperaccumulator Sedum alfredii with a grain crop, Zea mays. After a 3-month growth trial, the results indicated that when Z. mays is cocropped with S. alfredii, heavy metals accumulated in the grains were significantly reduced when compared to monoculture cropping. Cocropping improved the growth of both plant species and seems to be an effective approach to reduce the risk of contaminant uptake in edible crops.

Hyperaccumulator Thlaspi caerulescens is able to change conditions in rhizosphere shared with other plant species and subsequently affect the bioavailability of selected elements for adjacent plants. Hyperaccumulator cocropped with other plant species can either mobilize soil elements such as cadmium or on the contrary immobilize other elements [45]. The effect of cocropping of willow and hyperaccumulator Thlaspi caerulescens was investigated in pot experiment where the plants were planted either separately or in cocropping version. Moderately contaminated Cambisol and extremely contaminated Fluvisol (Table 7) were used as cultivation medium.

□ year! □year2 □ year3
Body Detox Made Easy

Body Detox Made Easy

What exactly is a detox routine? Basically a detox routine is an all-natural method of cleansing yourbr body by giving it the time and conditions it needs to rebuild and heal from the damages of daily life and the foods you eat and other substances you intake. There are many different types of known detox routines.

Get My Free Ebook


Post a comment