Identification of soil constraints affecting root crop production
1991
Bautista, A.T. | Armecin, R.B. (Visayas State Coll. of Agriculture, Baybay, Leyte (Philippines). Philippine Root Crop Research and Training Center)
Soil samples were gathered in 46 pedons representing major root crop producing areas in the country. Results of soil chemical analysis showed the various soil chemical properties affecting root crop production such as low level of available Phosphrous (P), high amount of exchangeable Aluminum (Al), total acidity and clay content. Chemical analysis exhibited the following ranges for different soil chemical properties such as soil pH (4.1-8.08); percent Organic Matter (OM) (0.01-9.07); Total acidity (trace-3S.1d me/100 g); Exch Al (trace 15.75 me/100 g); and Av. P (trace-636.14 ppm using Bray no. 2). The lowest pH value was obtained in Guimbalaon clay while the highest soil pH value was exhibited by Faraon clay. Soils with high levels of Exchangeable Al and Total acidity which are above the critical levels for root crops includes Castilla clay loam, Tigaon clay, Bayugan clay, Catbalogan clay, Palompon clay, Maasin clay and unidentified mountainous soil. Root crop soils which contains low amounts of available P are Catbalogan clay, Lugo clay, Palompon clay, Faraon clay and Maasin clay. Relationship between pH-H2O and pH-KCl; soil pH (H2O) and Total acidity; soil pH (H2O) and Av-P; and percent clay content and percent OM was also discussed
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