Investigation of actual conditions of content of nitrateit and manure method for nitrate decrease making in lettuce [Lactuca sativa] cultivation
2008
Ohi, Y.(Nagasaki-ken. Agricultural and Forestry Experiment Station, Isahaya (Japan)) | Ohtu, Y. | Yoshino, Y. | Terada, M.
The actual condition of nitrate content included in lettuce was investigated in the lettuce cultivation home in Nagasaki Prefecture. Moreover, the manure method that took the examination of fertilizers containing nitrification inhibitor and the effect of the nitrogen supply from poultry waste compost into consideration was examined as an improvement plan of the manure system for making about acceptable food of lettuce decreases of nitrate content. 1) Nitrate content included in lettuce in acceptable food was 1,366ppm that harvest within the year on the average and was 1,103ppm that harvest in the next year on the average, as an investigation of actual conditions result of the lettuce home. Those values were lower than 3,000ppm that was the reference value of EU. 2) In the lettuce within the year, there was a positive correlation between the amount of applied nutrient and nitrate content of lettuce. However, there was no correlation in age dawning. 3) By using fertilizers containing nitrification inhibitor under the cultivation condition of reducing 40% of the amount of nitrogen, the yield of lettuce can be maintained at the habitual practice level, and nitrate content of lettuce acceptable food has decreased. 4) When you substitute 25-50% of the amount of manure of 20% decrease of the amount of the nitrogen manure from the habitual practice with poultry waste compost, the yield of lettuce can be maintained at the habitual practice level and nitrate content of lettuce acceptable food has decreased. However, there should be a lot of one of the compost of poultry waste compost with high bases such as potassium and calcium, and an alternative rate of compost consider the base.
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