Both neem oil coated and Sulfur coated Urea are recommending as slow release N fertilizer. The question is which one is more efficient in respect of slow release and N use efficiency.
Dear Dr. Tarafdar, our multilocational field trials under AICRIP on Rice showed superiority of sulfur-coated over neem-coated urea. But in consideration of economy, we we recommended use of neem-coated urea as N source for rice. Neem coated urea performed better than split applied prilled urea in diverse soil types. A 10-15% higher efficiency in N use in rice was recorded in our AICRIP trials.This material also proved to be an efficient source of N for rainfed lowland rice where water control in field is poor. You may go through the following publication for reference: Pillai KG and Kundu DK (1993) Fertiliser management in rice. Pages 1-26 in Fertiliser Management in Food Crops (Ed. HLS Tandon),FDCO, New Delhi.
Both neem oil coated and Sulfur coated Urea are useful for slow release N fertilizer. But sulfur coated urea will be useful as it will also be adding sulfur to the soils boosting the yield.
To have a ecofriendly soil , i would prefer to have neem oil coated, especially water soluble neem oil coated urea .
In perennial crop like citrus , we tested the two types of coated urea during pre-bearing years for five seasons , where there was no significant different difference in crop response during first three seasons . Later in the next two seasons , the response of neem oil coated urea was much better over sulphur coated urea, because of the slower and extended N release over an extended growth period.
DR. Srivastava, do you find any differences in N use efficiency in your experiment?
Dear Dr. Tarafdar, our multilocational field trials under AICRIP on Rice showed superiority of sulfur-coated over neem-coated urea. But in consideration of economy, we we recommended use of neem-coated urea as N source for rice. Neem coated urea performed better than split applied prilled urea in diverse soil types. A 10-15% higher efficiency in N use in rice was recorded in our AICRIP trials.This material also proved to be an efficient source of N for rainfed lowland rice where water control in field is poor. You may go through the following publication for reference: Pillai KG and Kundu DK (1993) Fertiliser management in rice. Pages 1-26 in Fertiliser Management in Food Crops (Ed. HLS Tandon),FDCO, New Delhi.
Not at all Dr Tarafdar in first three seasons, and later i did find . My point is , why should we consider the N-use-efficiency and crop response as two independent criterion...?
Dr. Srivastava slow release and use efficiency is directly correlated specially in case of N as due to slow release there will be minimum loss leaching and denitrification so more N would be available for the uptake.
There could be higher plant assimilable N in the soil , but crop demand driven availability is more important , which kind of nutrient efficiency is more important , simply agronomic efficiency or physiological efficiency..?
This article can help you regarding to study about coated urea release.
Slow release coating remedy for nitrogen loss from conventional urea: a review
Article Slow release coating remedy for nitrogen loss from conventio...
I think neem coated will be more better as it act as slow release, effective and pesticidal value.
Sulphur coated urea needs further studies in India, though it is costlier than neem coated urea. The contribution of sulphur coated urea to sulphur nutrition of crops also needs quantification.Is there any review of work done on sulphur coated urea on different crops in India?
Depending upon soil chemical properties and nutrient status both neem oil coated and sulphur coated urea can prove propitious in achieving high use efficiency of N fertilizers.
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