Economic Weed Management
- Weed management is to reduce the weed population to a level where their presence has no negative effect on the areas of economic use.
- The most important principle is to resort to weed control only when it is absolutely necessary. In other words, mere presence of weeds should not be taken very seriously unless they cause economic losses.
- rule in weed management-The cost of weed control should not be more than the loss caused by the weeds.
- The recent shift from transplanting to direct seeding of rice in Asia has resulted in dramatic changes in the types and intensity of weeds and their distribution.
- Additionally, higher fertilizer usage by farmers, for realizing higher grain yields of modern semi-dwarf HYVs and hybrids, are also conducive for weed proliferation and their intense growth.
Effective and economic weed controlsystems combine preventive, cultural, mechanical, chemical, and biological methods.
- Judicious combination of appropriate rice varieties.
- crop husbandry practices that enhance robust seedling growth and stand establishment.
- need based nutrient use.
- cultural practices that reduce weed proliferation and clean cultivation practices.
- biological control that breaks the weed life cycle and reduces environmental pollution.
- using weed-free seed, crop rotation, leveling of land, seedbed preparation, selecting the proper seeding method.
- managing water and fertilizers properly.
- The use of herbicide treatments that selectively control weeds in rice when applied correctly.
- Indiscriminate as well as continuous use of herbicides, may lead to development of herbicide resistance in weeds as well as increasing public concern about its effect on environment and human health.