The first step of seed germination is water imbibition. Rapid imbibition, particularly at law temperatures, is damaging to the seed of many commercial crops. Additionally, seeds will imbibe water at temperatures below which germination can occur. These seeds then reside in cool damp soil until a warmer soil temperature, necessary for germination, is reached. During this time they are prone to water stress damage, and fungal attack. Landec Labs, Inc. has developed a polymeric membrane which is a good moisture barrier at low temperature, then becomes permeable at slightly higher temperatures. This temperature range can be selected to coincide with the optimum germination conditions for specific seed species. A seed coating technology is proposed which prevents water imbibition below a selected temperature, yet allows rapid germination above that temperature.Applications:Temperature controlled seed germination timing by use of these polymers will provide significant economic advantages to growers. Reduction in water stress damage to early planted seed will improve seedling growth rates, disease resistance, hardiness and stand. Because the coated seed would germinate over a narrow temperature and time window, the crop stand will be more uniform. A uniform crop stand optimizes subsequent cultivation, fertilization, post directed herbicide application and harvesting operations. Protection of seed from adverse effects of cold wet soil prior to germination will reduce fungicide needs.
