Paddy threshed and dried immediately in paddy husker from ricepolisher's blog

Threshing delays can cause grain yellowing due to stack burning, mold growth in heated piles, and mycotoxin. A 1-day threshing delay of cut crop in a conical pile (mandala) and small rectangular piles resulted in 17% and 5% yellow grains, respectively, whereas a 5-day delay resulted in 68% and 40% yellowing of grains in the mandala and small rectangular piles, respectively. Delayed drying of wet grains results in stack burning due to non-enzymatic browning, microbial growth, and mycotoxin production in parboiled rice. In another study, 100% yellowing of the grain was noted in wet paddy with more than 20% MC. Mold growth and heating of the grains were noted. Heating of the heap occurred within 1 day, mold growth was visible after 2 days, and yellowing of the grains happened within 5 days. Paddy threshed and dried to 14% MC immediately in paddy husker after harvest yielded < 1% yellow grains.

Rough rice drying plays an important role in post-harvest practices. Excessive losses can be avoided if drying had conducted properly. Head rice yield (HRY) is a commonly accepted standard for measuring rice milling quality. After harvesting, in major rice producing regions of Iran, there would be delayed rough rice drying and milling due to great deals of produced paddy and low capacity of rice milling plants. This research aimed to investigate the effect of various drying dates on milling recovery head rice yield. The experiments were conducted on five different dates of 0, 15, 30, 60, and 90 days after harvesting and two long grain cultivars of Hashemi (local) and Khazar (improved). The results revealed that cultivars and drying dates had significant (p<0.01) effects on head rice yield. Head rice yield for Hashemi had a decreasing trend under delayed drying dates whereas there was not such a circumstance for Khazar.


It is observed that in conventional paddy separator operating cost of using husk and coal is less than auto paddy separator. But capacity and economical profit comes more in auto rice mill. Through comparative study it is found that the efficiency of using both husk and coal comes out to be the same, but their comparison varies when discussed about economic and expenditure of plant. It is seen that the price / day of using husk is more than that of coal which implies that husk used as fuel is more beneficial than using coal as fuel. When both the fuels are compared i.e. husk and coal then, it is concluded that husk as fuel is used free of cost but coal much maintenance requires which leads it to have more cost in comparison to husk and also pollution created by coal is more than that of husk, which makes husk more reliable than the coal.

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By ricepolisher
Added May 29



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