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Effect of soil amendment with alfalfa pellets and glycerol on nutrition and growth of wheat

Date

2008-02-28

Authors

Qian, P.
Schoenau, J.J.
King, T.
Fatteicher, C.

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Poster Presentation

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Abstract

Two pot experiments were carried out under controlled environment conditions in the laboratory. One was to assess the ability of alfalfa pellets to supply plant available N as an organic fertilizer. The other was to investigate the impact of applying glycerol on crop growth and soil characteristics. In the first experiment 4 different rates of two types of alfalfa pellets were tested by comparing with urea. In the glycerol addition experiment, four different rates of glycerol were tested. Wheat biomass yield, N and P uptake were measured in both experiments. Soil organic C, available N and P were also measured in the glycerol experiment. Results from the alfalfa pellet experiment showed that application of alfalfa pellets lead to a significant wheat biomass yield response and an increase in N and P uptake, even at the lowest application rates. Glycerol addition increased wheat yield biomass and N uptake at low and medium rates (100 and 1000 kg /ha) but resulted in reduced yield at the highest rate (10,000 kg/ha). The yield reductions at the highest rates were believed to be associated with N immobilization. In general, negative impacts on wheat growth were observed only at higher rates. Higher rates of glycerol added to the soil led to an increase in soil organic C concentration and a decrease in soil extractable nitrogen and phosphorus. Future experiments with glycerol addition will evaluate the effect of combination of glycerol with commercial fertilizer urea, and its effects on microbial respiration.

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Keywords

yield, uptake, soil N and P availability, soil organic C

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Part Of

Soils and Crops Workshop

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