Sugarcane response to nitrogen fertilization in a long-term trial with 24 accumulated harvests
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Abstract
and development, which increases cane and sugar yields when
it is rationally used. In this regard, an investigation was carried
out for 27 years, with the objective of defining yield behavior
with different doses of N applied to a sugarcane agroecosystem
where burning is used to harvest. A long-term N
level trial was conducted under unirrigated conditions, with
four planting cycles and 24 harvests. An eutric typical Red
Ferralitic soil was employed. Plant cane did not respond to N
fertilization; the response was not systematic in the first ratoon,
but it became more stable in the second one and there was
always a response from the third ratoon on, whereas the
required N doses were different per each cycle, it decreasing
from the fourth ratoon on with regard to the previous cycles. In
general, N needs diminished with rainfall increment.
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