NGHIÊN CỨU HỆ THỐNG CANH TÁC LÚA - ẾCH
NHẰM HẠN CHẾ MỘT SỐ CÔN TRÙNG GÂY HẠI
VÀ NÂNG CAO THU NHẬP Ở VÙNG ĐỒNG BẰNG SÔNG HỒNG
Tạ Minh Sơn, guyễn Thế Yên
SUMMARY
Research Rice -Frog Farming System to Minimize some Damaging Insects and
Enhance Income for Farmers in Red River Delta (RRD)
Monoculture rice farming is a common form in the Red River Delta (RRD). This
farming has created favorable conditions for the development of many types of insect and
diseases, THEREBY causing loss of crops. To ensure the rice productivity, farmers have to
use large amounts of plant protection chemicals. This not only increases production costs
but also causes negative impact on the environment and ecological imbalance of paddy
field. Results from experiments in 2007-2009 indicated that Thai hybrid frogs had highest
yield and P6 rice variety is most suitable for the farming systems. A rice cultivation
technique “border effect” by changing in distance between row and rice plants has
created a favorable condition for the development of frogs. Results from experiments of
four rice plant on P6 rice variety showed that D2 density of 40 hills/m
2
(12 cm by 25 cm) is
best for frogs walking and jumping to catch prey, and rice yield of 5.4-5.8 tons/ha/spring
and 4.8-5.2 tons/ha/summer crop season. Results from experiments of three frog densities:
(2,700; 5,400 and 8,100 frogs/ha) showed that the density of 10,000 frogs/ha had high
effect and suited for the intensive farming conditions of farmers. The bigger the released
frogs the shorter the time to, but economic efficiency is highest when the released frogs
quantity 40-50g/frog. Results also showed that paddy field with released frogs reduced
about 2-3 times of pesticide sprays during the time from till ring to panicle differentiation.
Using pesticides namely as Regent 800WG, Virtako, Trione and Validacine did not affect
the growth and development of frogs in rice fields. Results of testing models in Hai Phong
(1ha) and Hai Duong in summer crop season in 2009 showed a total income from one rice
and one frog harvesting season was from 99.4 to 108.6 million VD/ha/crop season. et
interest income was 37.2 to 43.6 million VD/ha/crop season. From these results, we
suggested that rice-frog farming systems for high rice yield, reduce cost of plant protection
chemicals, increase farmer's income and create ecological balance.
Keywords: Rice, Frog, System, Farming, Cultivation, Insects; Income.
