Estimation of chemical availability indexes of soil nitrogen

Aerobic and Anaerobic Incubation — Biological Indexes of Soil Nitrogen Availability

Our researches have been made on brown forest soil that had been used in long-term experiments set up according to specified fertilization system for over 30 years. We have chosen those experiment variants in which quantities of nitrogen fertilizers were gradually increased. The soil samples taken from 0 cm to 30 cm depth were used to determine biological indexes of nitrogen availability (aerob...

Soil and Plant Nitrogen Availability

Influence of Sampling Date on Soil Nitrogen Availability Indices

Soil N Availability and Nitrogen Harvest Index of Oats

Evidence that Invasion by Cheatgrass Alters Soil Nitrogen Availability

We hypothesized that cheatgrass (Bromus tectorum), an exotic invasive annual, may alter soil nitrogen availability. In the Honey Lake Valley of northeastern, California, we have monitored soil and vegetation along a chronosequence of cheatgrass invasion. In 2007, we measured total C, total N, and N in tissue of cheatgrass, winterfat (Krascheninnikovia lanata), freckled milkvetch (Astragalus len...