Effect of chemical form of fertilizers on chemical stress to soil in vinyl-house cultivation
1996
Ono, S. (Shikoku National Agricultural Experiment Station, Zentsuji, Kagawa (Japan)) | Mori, A.
The intensity of chemical stress of chemical fertilizers to soil under vinyl-house cultivation was examined by beaker and pot experiments. High-stress-type fertilizer was composed of ammonium sulfate, superphosphate and potassium chloride, and low-stress-type fertilizer was composed of ammonium nitrate, potassium phosphate and potassium nitrate. Application of high-stress-type fertilizer increased the EC value and lowered the pH value in soil, but application of low-stress-type fertilizer did not change the EC and pH values in soil. Continuous application of high-stress-type fertilizer at transplanting increased the EC value and lowered the pH value in soil progressively. On the other hand, continuous application of low-stress-type fertilizer hardly changed the EC and pH values in soil even after cultivation 6 times. Low-stress-type fertilizer give a slight chemical stress on soil because of lack of concomitant, i.e., SO4(2-) and Cl(-)
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