Document Type : Research
Authors
1
MSc Student of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
2
Professor, Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
Abstract
The effects of the combined application of biochar pyrolysed at 300 ˚C and phosphorous (P) fertilizer on some agronomical and morphological traits of the Hyola 308 cultivar of rapeseed (Brassica napus L.) as well as the associated water use efficiency were studied in an alkaline loam soil. For this purpose, a factorial experiment was conducted in a completely randomized design with three replicates. The factors were organic matter with two sources (biochar and wheat straw) at three levels (0, 20, and 40 g kg-1) and three levels of phosphorus (0, 20, and 40 mg kg-1 as triple superphosphate fertilizer). Prior to harvesting, leaf chlorophyll index and leaf area were measured while shoot, root, and seed dry matter as well as water use efficiency, plant height, stem diameter, root volume, number of pods, one-thousand seed weight, seed oil content, and seed protein concentration were measured after the harvest. The results showed that application of phosphorus and both levels (2% and 4% of biochar significantly increased leaf chlorophyll index, stem height, number of pods, one-thousand seed weight, water use efficiency, protein and seed oil contents as well as shoot, root, and seed dry matter contents compared to the control; application of wheat straw, however, led to decreases in these traits except for water use efficiency. Moreover, compared to the initial biomass, the biochar obtained from wheat straw pyrolyzed at 300 ◦C in an alkaline loam soil improved rapeseed agronomical and morphological traits in an alkaline loam soil.
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