This research is quite interesting and the data can be use as data base. Anyhow, I do recommend the author(s) to revise this manuscript for improvement. The comments as follows:
1. There are too many keywords, please deduct to only 5 keywords
2. Be carefully to check the significant number in text as well as in the tables
3. Figure 1 are not clear for visibility
4. In part 2. (p.3), the author(s) should refer to the standard or reference methods which used in this manuscript because (in my opinion) there are possibility for the contamination of Cu in your sample from tools or equipment in these experiment
5. The author(s) should mention about how to prepare the solution (ex.std sol.) which use as working standard, of course, the author(s) using ref std (SRMs) but normally SRMs use for confirm or testing the experiments
6. (from p.5) The author(s) are not describe the criteria or reasons for using only low Cu concentration to make the correlation between soils and rice grains and the area as well. The author(s) should use all data to find out the relationship in the over all, and using all data existing in each district for area base correlation
7.The author(s) has lack discussion such as why those study areas has higher Cu than other or compare to the other in more details. Or, how much % of Cu accumulation in rice from soil and could be extent to species differentiation
8. There are many similar research, pls compare and more discussion in the part which related to your data. Many ref are out date and also pls up-to-date the references.
This research is quite interesting and the data can be use as data base. Anyhow, I do recommend the author(s) to revise this manuscript for improvement. The comments as follows:
1. There are too many keywords, please deduct to only 5 keywords
2. Be carefully to check the significant number in text as well as in the tables
3. Figure 1 are not clear for visibility
4. In part 2. (p.3), the author(s) should refer to the standard or reference methods which used in this manuscript because (in my opinion) there are possibility for the contamination of Cu in your sample from tools or equipment in these experiment
5. The author(s) should mention about how to prepare the solution (ex.std sol.) which use as working standard, of course, the author(s) using ref std (SRMs) but normally SRMs use for confirm or testing the experiments
6. (from p.5) The author(s) are not describe the criteria or reasons for using only low Cu concentration to make the correlation between soils and rice grains and the area as well. The author(s) should use all data to find out the relationship in the over all, and using all data existing in each district for area base correlation
7.The author(s) has lack discussion such as why those study areas has higher Cu than other or compare to the other in more details. Or, how much % of Cu accumulation in rice from soil and could be extent to species differentiation
8. There are many similar research, pls compare and more discussion in the part which related to your data. Many ref are out date and also pls up-to-date the references.
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