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- W2243367819 abstract "Nitrogen recommendations for sugarcane are currently based largely on responses of variety NCo376 in the various bioclimatic regions of the industry, together with an estimate of the nitrogen (N) mineralisation potential of the soil. However, previous studies suggest that commercial varieties differ in their N use efficiency, thus indicating a need for varietyspecific N recommendations (Meyer et al., 2007). A nitrogen response trial using varieties N19 and N32 was conducted at the Komati Research Station in Mpumalanga during the period 2001 to 2007. In 2007, a similar trial was established on the Komati farm using varieties N25 and N36. Nitrogen was applied at three rates: zero N, 50% and 100% of the Fertiliser Advisory Service (FAS) recommendation. In the first experiment, N19 was found to be less responsive to N than N32, with there being a relatively diminished response in the case of N19 from the second to the highest N level. In contrast, in most trial years, N32 responded continuously to N up to the highest application level. These patterns of response were supported by data from N balance measurements: N32 required more N to achieve maximum sucrose yield, whereas for N19, N losses increased markedly at the highest N rate. Preliminary data from the second experiment (plant and 1st ratoon crops) suggest that N36 is more responsive to N than N25. In these trials, yields from the zero N treatments were remarkably high, ranging from 80 to 145 tons cane/ha), and indications are that this was attributable to high N amounts mineralised from the former virgin soil and, to some extent, to high N levels in the irrigation water. Both these effects would account for the generally low responses to N fertilisation in the trials, and demonstrate the importance of accounting for all possible N sources as part of the N balance." @default.
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- W2243367819 date "2010-01-01" @default.
- W2243367819 modified "2023-09-23" @default.
- W2243367819 title "NITROGEN RESPONSES AND NITROGEN USE EFFICIENCY OF FOUR SUGARCANE VARIETIES IN MPUMALANGA" @default.
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