PERBAIKAN KUALITAS BAHAN PEMBAWA Rhizobium dan FUNGI PELARUT FOSFAT MELALUI STERILISASI SINAR GAMMA Co-60 DAN PENGARUHNYA TERHADAP PERTUMBUHAN DAN PRODUKSI KEDELAI (Glycine max L.)

Taufiq Bachtiar, Iswandi Anas, Atang Sutandi, Ishak Ishak

DOI: http://dx.doi.org/10.17146/gnd.2019.22.1.4405

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ABSTRAK

PERBAIKAN KUALITAS BAHAN PEMBAWA RHIZOBIUM dan FUNGI PELARUT FOSFAT MELALUI STERILISASI SINAR GAMMA Co-60 DAN PENGARUHNYA TERHADAP PERTUMBUHAN DAN PRODUKSI KEDELAI. Varietas unggul kedelai yang dihasilkan dari teknik mutasi radiasi harus didukung oleh teknologi pertanian seperti penggunaan pupuk hayati. Penelitian ini dilakukan untuk mempelajari pengaruh iradiasi gamma Co-60 terhadap 1) sifat kimia bahan pembawa, 2) viabilitas mikrob dalam bahan pembawa, 3) pertumbuhan dan produksi kedelai varietas Mutiara 3. Komposisi bahan pembawa yang diuji meliputi b0= 100% gambut (%w/w), b1= 50% gambut + 50% biochar (% w/w), b2=50% gambut + 50% fosfat alam (% w/w), b3=50% gambut + 25 % biochar + 25 % fosfat alam (% w/w), b4=100% biochar (% w/w). Metode sterilisasi yang digunakan yaitu dengan iradiasi sinar gamma Co-60 (r) dan autoclave (a). Hasil menunjukkan komposisi bahan pembawa dan sterilisasi sinar gamma berpengaruh terhadap sifat kimia bahan pembawa yaitu pH, NO3, dan P tersedia. Viabilitas Rhizobium R35 dan fungi pelarut fosfat FPF4 dengan jumlah populasi tertinggi diperoleh pada bahan pembawa biochar dengan sterilisasi iradiasi sinar gamma.  Penggunaan pupuk hayati dengan bahan pembawa biochar yang disterilisasi dengan iradiasi sinar gamma Co-60 berpengaruh nyata dalam meningkatkan serapan N dan serapan P pada biji, dan hasil tanaman kedelai varietas Mutiara 3.



Kata Kunci


sterilisasi, iradiasi, sinar gamma, kedelai, pupuk hayati

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Referensi


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