QUESTIONS WITH ANSWERS GRADED A+
✔✔Hydration - Dehydration - ✔✔process of soaking the low and medium vigour seeds
in water with
or without added chemicals usually for short durations to raise the seed moisture
content to 25 - 30%
and drying back the seeds to safe limits for dry storage.
✔✔- Should be given only to stored seeds.
- Is effective in low and medium vigour non-leguminous seeds.
- The moisture equilibration and moist sand conditioning treatments in which moisture is
taken up
by the seed in a slow and progressive manner, are recommended for relatively high-
vigour seeds
and seeds of pulses and leguminous vegetable crops.
- Direct soaking of leguminous seeds should be avoided
- Would not make a seed germinable, which has already lost viability. - ✔✔The
hydration - dehydration treatments
✔✔Soaking - Drying (S-D) - ✔✔Stored seed is soaked in water or solution of chemicals
sufficient to cover it and kept at room temperature for 2-6 hour depending on the
material with occasional stirring.
✔✔Dipping - Drying (D-D) - ✔✔Seeds are dipped in water or solutions of the aforesaid
chemicals for only
2-5 minutes and the wet seed is taken out immediately and kept covered for 2 - 6 hours
depending
on the material, for absorption of surface water followed by drying back in S-D. This
treatment is
effective in most high and high-medium vigour seeds of rice, wheat, jute, summer and
winter
vegetables
✔✔Spraying - Drying - ✔✔Seeds are spread in a thin layer and then an amount of water
(approximately
1/5 to 1⁄4 of the seed weight) is sprayed on to it in two equal installments (turning over
the seed
layer after the first spray) and then kept covered by a polythene sheet for 2-4 hours
before drying
back. This treatment is similar to D-D in its efficacy and suitability.
✔✔Moisture Equilibration - Drying (ME - D) - ✔✔seeds are placed in thin layers on trays
kept