5/18/2023 0 Comments Subler stanleySoil treatment with either Z93 or W91 influenced phosphatase activity strongly but did not have much effect on SIR or DHA. Most of the soil and plant responses to treatment with Z93 or W91 differed according to the type of organic amendment that was used. To follow the movement of nitrogen from inorganic fertilizer into plant biomass we used a 15N isotopic tracer. ![]() We measured their effects on soil microbial activity (substrate-induced respiration (SIR), dehydrogenase activity (DHA) and acid phosphatase activity (PHOS)), soil nitrogen pools (microbial biomass N, mineral N, dissolved organic N), and transformations (net N mineralization and nitrification, 15N dilution of the mineral N pool, and accumulation of mineral N on ion-exchange resins), and on wheat plant germination and growth (shoot and root biomass, shoot length, N uptake and 15N enrichment of shoot tissues), for up to 56 days after treatment. Soils were treated in the microcosms with Z93 and W91 at rates equivalent to the recommended field application rates, that range from 0.2 to 1.1 l ha−1, (0.005–0.03 μl g−1 soil). In laboratory microcosm experiments, soils were amended with finely ground alfalfa-leaves or wheat straw, or left unamended, in an attempt to alter patterns of soil nitrogen mineralization and immobilization. These compounds are commercially marketed fermentation products (Agspectrum) that are sold to be added to field soils in small amounts to promote nitrogen and other nutrient uptake by crops in USA. ![]() The influence of two experimental soil treatments, Z93 and W91, on nitrogen transformations, microbial activity and plant growth was investigated in soil microcosms.
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