Leaching of nitrogen, potassium, calcium and magnesium in a sandy soil cultivated with sugarcane

Pesquisa Agropecuária Brasileira

Mauro Wagner De Oliveira²  Paulo Cesar Ocheuze Trivelin¹  Antônio Enedi Boaretto¹  Taskashi Muraoka¹  Jeferson Mortatti¹ 

[1] ,Universidade Federal de Viçosa Centro de Pesquisa e Melhoramento de Cana-de-Açúcar Ponte Nova MG

关键词: fertilizers;    mineral nutrients;    soil transport processes;    lysimeters;    adubos;    nutrientes minerais;    processos de transporte no solo;    lisímetro;   

DOI  :  10.1590/S0100-204X2002000600016

来源: SciELO

【 摘 要 】

A lysimeter experiment was carried out with sugarcane aiming to evaluate the leaching of nitrogen derived from either urea (15N) or the soil/sugarcane crop residues. The leaching of K+, Ca2+, and Mg2+ was also evaluated. The experiment was a factorial 2x4. The influencing factors were: firstly, the differential addition of two kinds of sugarcane remains to the soil, simulating conditions of cane- plantation renewal after the cane crop harvest, with and without previous straw removal by burning; secondly, four doses of N: 0, 30, 60, and 90 kg ha-1. During the experimental period the total volume of water received by the sugarcane-soil system was 2,015 mm, with 1,255 mm as precipitation and 760 mm as irrigation. The loss of N by leaching from the fertilizer (15N) was not detected. In the first three weeks the largest losses of N by leaching occurred, originating from the soil/sugarcane remains-N. The mean of leached N during the experimental period of 11 months was of 4.5 kg ha-1. The mean losses of K+, Ca2+, and Mg2+ were of 13, 320 and 80 kg ha-1, respectively.

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