To find an alternative for synthetic pesticides, methanol extracts from 69 plant samples were tested for their insecticidal activity against two spotted mite (Tetranchus urticae Koch). Seven plant extracts including Angelica japonica showed over 80% insecticidal activity at 5000 mg/L. Extract of Prunus armeniaca seed showed high insecticidal activity at 3000 mg/L. As a naturally occurring pesticide, P. armeniaca could be useful as a new botanic insecticide.

Soil NH4-N content became higher in proporlion to the increase in the urea application rate, while in livestock faeces compost (LFC) plots, it became lower than in urea plots and had no significant difference statistically among LFC plots. There was a close relationship between phosphate ferlilization rate and the increment of soil available phosphate content after experiment resulting y=O. 1788x-6. 169 (R~=O. 9425) when applied fused superphosphate ferlilizer, and y=0.0662x-2.689(R~=0.9315) when applied LFCs by the same amounts of phosphate (x: phosphate application, kg ha, y: increment in soil available phosphate content, mg kg). Plant height, number of stems, nutrients uptake by rice and rice yield showed higher levels in N 100, 150% application plots of chemical ferlilizers, while every LFC plots exhibited lower values and no significant difference among them. Relative nitrogen ferlilization efficiencies of LFCs compared to urea was 12.3% for cattle faeces compost (CaFC), 8.8 for swine faeces compost (SwFC) and 24.6 for chicken faeces compost (ChFC), respectively.