Due to high rise of temperature, seedlings of annual crops and even that of perennial are facing sun burnt where the leaves are half dried and half green.What is the apt remedy to overcome this problem?
Mz. Buhroy,
Avoidance is by far the most effective means to circumvent this kind of damage. If possible, seedlings should be placed under a lath house or shade cloth. Even an 80% transmittance shade cloth will reduce the temperature and UV radiation at the leaf level enough to reduce plant stress. Exceeding 50% transmittance may block too much PAR and cause seedlings to stretch.
If shade is not an option, then intermittent misting during the times when light is most intense would be beneficial.
If neither of these solutions is an option, then remember that plants which are well irrigated can tolerate more sun and more heat, so avoiding drought stress is as simple as that.
Best of luck to you in your research!
If this problem occurred at the time of seedlings transplantation, you need to do transplanting at evening time and transplant with complete root ball, with giving least transplanting shock. Also harden up the seedlings in nursery to field conditions before transplantation.
As to me it is good to arrange shade in such a way to reduce the temperature to the level of the seedlings tolerance. likewise, it is good to water the seedlings early in the morning and late in the afternoon to reduce the burning effects of the applied water due to high temperature.
Application of potassium can be useful. However should be applied in foliar application if possible. In advance before crop cultivation during land preparation the zinc and FYM also added. Seed primed with potassium and phosphorus.
The remedies may vary from crop to crop. For high value cash crop- shade provision can be made- but it is costely, hence can used in only high value crops.
Another option for field crops is the mulching. It may be organic with crop resideue or inorganic with polethene. Mulching acts in two ways- First is it decreases the albedo in that perticular area, as reflected light radiations are lowered, the sun burn injuries to crop are also decreased. Second, mulching decterases trhe rate of evaporation and it keeps proper moisture in soil, which is very usefull to avoid or combat to the high solar radiation injury.
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