C. Garcia et al., NITROGEN USE EFFICIENCY WITH THE APPLICATION OF CONTROLLED-RELEASE FERTILIZERS COATED WITH KRAFT PINE LIGNIN, Soil Science and Plant Nutrition, 43(2), 1997, pp. 443-449
The aim of the present paper is to assess the efficiency of several ex
perimental fertilizers in a soil-plant system, The laboratory-prepared
fertilizers consisted of granular urea coated with Kraft pine lignin,
Five fertilizers were used with coatings differing in thickness and/o
r the addition of linseed oil as a sealing agent, The experiment was c
arried out in pots inside a glasshouse, The crop used was rye-grass, R
esults were compared with those from a urea control treatment without
coating and a soil without fertilizer application. The dry matter yiel
d and the hi uptake by the plant were higher in the treatments with co
ated controlled release fertilizers (CRF) than in those with uncoated
urea, There was a lower nitrogen loss through leaching when using CRF
(34 to 68%) was used than when using uncoated urea (over 74%) was used
, The N use efficiency was lower for urea than for coated fertilizers,
This index increased with the thickness of the coating and the additi
on of the sealing agent.