A. Kanal et P. Kuldkepp, DIRECT AND RESIDUAL EFFECT OF DIFFERENT ORGANIC FERTILIZERS ON POTATOAND CEREALS, Journal of agronomy and crop science, 171(3), 1993, pp. 185-195
Field experiment with 8 different organic fertilizers (cattle dung wit
h and without litter, pig slurry, peat compost formed from hen and pig
slurry, sawdust-duck manure, noncomposted peat and straw litter with
pig slurry) was carried out on loamy brown podzoluvisol since 1985. Th
e organic fertilizers were applied in the spring of 1985 on two backgr
ounds: with and without mineral fertilizers. The material is based on
the data of four years (1985-1988). The arrangement of crops was the f
ollowing: potato, spring wheat, barley and early barley. On both backg
rounds cattle dung with litter turned out to be the best organic ferti
lizer, while noncomposted peat manure had a low direct and residual ef
fect. However, before the application it must be composted with pig or
hen slurry. The effect of peat composts was dependent on the backgrou
nd of mineral fertilizers. Pig slurry had a low residual effect and ac
ted only as a liquid nitrogen fertilizer. The joint application of str
aw and pig slurry can be a suitable opportunity for diminishing their
undesirable effects.