Jeruk di Lahan Gambut Mamuju

KARAKTERISASI LAHAN DAN TANAMAN JERUK SIAM DI LAHAN RA
Sutopo, Suhariyono, A. Sugiyatno,
Suratman dan M. Yusuf
Balai Penelitian Tanaman Jeruk dan Buah Subtropika

SUMMARY

Swamp area represent as special of citrus siam in Indonesia, but its productivity still more if compared to its potential. Unproportional fertilization and Phytophthora disease are known as causing factor. This research aim to get land characterization and citrus siam nutrition. For the first activity, land characterization was done by land surveying in order to observe land profile, take some sample of  land and  crop (leaf and fruit) in order to analyze there chemist characterize in laboratory. Land characterization had result shown that there were 5 land typology that have different performances (B-C  type of peat soil, C type of  peat soil, C type of alluvial soil, B-C type of sulfide alluvial soil, and C type alluvial peat soil).  Crop plant can live on the all soil type except on the first one because of the crop root had reached a coat of oxidize pirit in 75 cm depth ness already.  In general, land reaction on 0 – 50 cm deepness  is acid to very acid, low salinity, medium N to high, very high available P,  low K to high, low Ca, low Mg to medium, and high Fe.

RINGKASAN

Karakterisasi lahan dan tanaman jeruk Siam dilakukan di Kecamatan Sarudu, Kabupaten Sulawesi Utara, Propinsi Sulawesi Barat yang merupakan salah satu sentra utama  produksi jeruk di lahan rawa.  Penelitian bertujuan  mendapatkan karakter lahan dan nutrisi tanaman jeruk Siam pada lahan rawa. Hasil penelitian menunjukkan bahwa lahan sentra produksi jeruk terdiri atas 5 tipologi, dengan karakteristik kimia tanah pada kedalaman 0 sampai 50 cm : pH masam – sangat masam, salinitas rendah, kandunga N sedang – sangat tinggi, P tersedia sangat tinggi, K rendah – sedang, Ca rendah, Mg rendah – sedang, dan Fe tinggi.  Status hara daun yaitu N optimum – berlebih, P rendah – tinggi, K rendah – optimum, Ca optimum – rendah, Mg dan  S optimum, Zn rendah, Mn dan Cu optimum – rendah,  Fe dan B optimum, dan Mo optimum – tinggi. Semakin tinggi N tanah, kadar N daun dan asam dalam sari buah cenderung meningkat tetapi sebaliknya dengan kadar sari buah, kadar vitamin C dan PTT.  Penurunan P daun cenderung diikuti oleh penurunan kadar sari buah, tetapi kadar asam, PTT, dan vitamin C cenderung meningkat.  Peningkatan K tanah diikuti oleh peningkatan kadar K daun dan kadar asam pada sari buah, tetapi sebaliknya dengan kadar sari buah, PTT dan vitamin C.

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