Value of cane trash in nitrogen nutrition of sugarcane |
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Authors: | K F NG Kee Kwong J Deville P C Cavalot V Riviere |
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Institution: | (1) Sugar Industry Research Institute, Réduit, Mauritius |
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Abstract: | The significance of trash containing 0.3 to 0.5% N in the N nutrition of sugarcane (Saccharum hybrid sp.) was investigated in pot- and field experiments using15N-labelled trash. The data obtained from the pot study with 2 silty-clay loams (a Humic Nitosol and a Humic Acrisol) showed
that surface-applied trash (10 tonnes/ha), although ground to pass a 1-mm sieve, contributed less than 10% of N removed by
sugarcane. Uptake of trash N was most active during the initial 6 months of the experiment though at the end of the study
period of 18 months less than 15% of trash N was altogether recovered by sugarcane.
In the absence of fertilizer N in a field study on the Humic Acrisol (C/N ratio 22), unground trash (5 tonnes. ha−1) depressed soil N uptake by sugarcane by immobilizing available soil N. The field study moreover confirmed that the contribution
of trash N in the supply of N to sugarcane is negligible. The value of trash would reside in its capacity to increase over
the long term the organic matter level in the soils. |
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Keywords: | mineralization nitrogen sugarcane trash uptake |
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