PENGARUH PEMBENAH TANAH TERHADAP SIFAT FISIKA TANAH DAN HASIL BAWANG MERAH PADA LAHAN PASIR PANTAI BUGEL KABUPATEN KULON PROGO

Rajiman Rajiman, Prapto Yudono, Endang Sulistyaningsih, Eko Hanudin

Abstract

Penelitian bertujuan untuk: 1) mengetahui pengaruh pembenah tanah terhadap perubahan sifat
fisika tanah dan hasil bawang merah di lahan pasir pantai; dan 2) mencari bahan alternatif pembenah
tanah di tanah pasir pantai. Penelitian menggunakan Rancangan Acak Kelompok Lengkap Faktorial
terdiri atas 3 faktor. Faktor pertama adalah jenis tanah dengan takaran 30 t/ha (T) yaitu Grumusol (T1)
dan Lumpur (T2). Faktor kedua adalah jenis bahan organik dengan takaran 20 t/ha (B) yaitu pupuk
kandang sapi (B1) dan blotong tebu (B2). Faktor ketiga berupa dosis limbah karbit (A) yang
dibedakan menjadi 3 aras yaitu 0 t/ha (A0), 1 t/ha (A1) dan 2 t/ha (A2). Sebagai kontrol digunakan
tanah pasir tanpa pembenah tanah. Parameter yang diamati meliputi tekstur, berat volume, berat jenis,
porositas total, kadar lengas pF 2,54, pF 4,2, kapasitas air tersedia, berat segar, berat kering, berat
kering oven dan diameter umbi bawang merah. Hasil penelitian menunjukkan bahwa jenis tanah,
bahan organik dan limbah karbit di tanah pasir pantai nyata meningkatkan jumlah fraksi lempung,
debu, porositas, kadar lengas, menurunkan BV, BJ dan meningkatkan berat segar, berat kering, berat
kering oven dan diameter umbi bawang merah dibanding kontrol. Penggunaan jenis tanah, bahan
organik dan limbah karbit tidak nyata mempengaruhi hasil bawang merah. Lumpur, blotong dan
limbah karbit dapat dimanfaatkan sebagai salah satu alternatif pengganti grumusol dan pupuk kandang
di tanah pasir.
Kata kunci : bawang merah, lahan pasir, pembenah tanah

 

ABSTRACT
The objectives of study were to 1) study the effect of soil conditioner on soil physics and shallot
yield in coastal sandy land, 2) find out soil conditioner alternative in coastal sandy land. The research
was conducted by complete randomized design, which consists of three factors. First factor was soil
types at level of 30 t/ha (T) : grumusol (T1) and mud (T2). Second factor was organic matter types at
level of 20 t/ha: manure (B1) and sugarcane (B2). Third factor was waste of carbida (A), 0 t/ha (A0),
1 t/ha (A1), 2 t/ha (A2) and control. The observation of parameters was texture, bulk density, particle
density, porosity, water contents of pF 2,54; pF 4,2; available water capasity, fresh weight, dry weight,
oven dry weight and diameters of bulbs. The result showed that the soil types, organic matter types
and waste of carbida in coastal sandy land significantly increased on clay and silt fraction total,
porosity, water contents, fresh weight, dry weight, oven dry weight and diameters bulbs and reduced
to bulk density, particle density, sand fraction. The effect of the soil types, organic matter and waste of
carbida were not significant on the shallots yield. Mud, sugarcane “blotong” and waste of carbide can
be used as alternative substittution of grumusol and litter of livestock in coastal sandy land.
Key words: shallot, sandy land, soil conditioner

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