EVALUASI KESUBURAN TANAH PERKEBUNAN KARET DENGAN PENDEKATAN INDEKS HARA
Abstract
A survey aimed to evaluate and compare the soil nutrient status of rubber plantations through a nutrient index (IH) approach has been carried out in a rubber plantation territory in Central Java province, Indonesia (Jateng). Soil samples were taken at 0-20 cm depth in 18 locations in the northern and 19 in the southern region of Jateng. Five parameters of soil fertility, including organic carbon, total nitrogen, available phosphorus, available potassium, and soil acidity (pH), were determined for the soil samples in the laboratory to figure out the level of soil nutrient adequacy and calculated the IH value based on the soil fertility criteria for agricultural land. Our results showed that organic carbon was higher in the northern region (medium, IH=2,60) than in the southern (low, IH=2,41). Total nitrogen (N) was low in both regions (IH=2,20 and IH=2,41). Soil pH was acidic (IH=1,80 north, IH=2,10 south). Available phosphorus (P) was medium in the north (IH=3,45) and high in the south (IH=3,59). Available potassium (K) was medium in the north (IH=2,85) and low in the south (IH=2,29). A strong positive correlation (r=0,67, p<0,05) between soil and rubber leaf nutrients supported previous findings linking plant fertility to soil fertility.
Keywords: Hevea brasiliensis; nutrient; Central Java
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