Expanding rice planting areas is one of Government’s strategy that could overcome increasing rice demand nationally. However the more rice planting areas the more chemical fertilizer used, which has a deleterious side effect on the soil, environment and high in cost production. Therefore, it is necessary to develop a less or without chemical fertilizer rice production system through applying biofertilizer and combining with a proper cultivation technology such as management on plant spacing. An experiment was conducted at Pusakanagara Research Station, Indonesia during August to December 2018 to evaluate the effect of form and dosage of biofertilizer application at different plant spacing toward the growth and yield response of lowland rice. The experiment was arranged in split-split-plot design with three replications. The main plot was plant spacing, i.e T1 – Jajar Legowo pattern 2:1 (25 cm - 50 cm) x 12,5 cm and T2 – Jajar Legowo Pattern 4:1 (25 cm - 50 cm) x 12,5 cm. The sub-plot was form of biofertilizer, i.e W1 – powder and W2 – granule, while the sub-sub-plot was dosage of biofertilizer, i.e P0 – without biofertilizer (control), P1 – 150 g/ha, P2 – 250 g/ha, and P3 – 300 g/ha. The result showed The interaction between plant spacing (T) x form of biofertilizer (W) x dosage of biofertilizer (P) affected significant on tiller number and panicle length and not significantly at the yield and yield components of lowland rice soil. The highest yield at control with the powder form at Jajar Legowo pattern 2:1 was 8.7 t/ha miled dry grain, but not significantly different from other biofertilizer dosage level. Applying biofertilizer at a rate of 150 g/ha in the form of powder at Jajar Legowo pattern 2:1 could increase grain yield up to 2.5 t/ha more than Jajar Legowo pattern 4:1.

Penggunaan cabai keriting sebagai bahan makanan terus meningkat. Dibutuhkan peningkatan produksi melalui penggunaan varietas unggul dengan memanfaatkan lahan pasang surut yang banyak terdapat di Sumatera Selatan. Penelitian bertujuan mendapatkan genotipe cabai keriting IPB yang memiliki keragaan agronomi yang unggul dan berpotensi untuk dikembangkan di lahan pasang surut Sumatera Selatan. Penelitian dilaksanakan bulan Juli 2020 sampai Januari 2021 di lahan pasang surut sulfat masam potensial dengan luapan tipe C menggunakan rancangan acak kelompok dengan tiga ulangan. Genotipe yang diuji adalah enam cabai keriting IPB F10-120005-141-16-35-3-2B, F10-120005-141-16-35-1-4-3B, F10-120005-141-16-35-7-1-3B, F10-120005-241-2-9-4-4-1-1B, F10-120005-120-7-1-7-8-1-2B, F11-0005-9-6, dan empat genotipe pembanding SSP, Laris, Caman, F1-PM999. Data dianalisis ragam dengan uji lanjut Beda Nyata Jujur. Hubungan antar peubah dianalisis korelasi Pearson. Genotipe uji F10-120005-120-7-1-7-8-1-2B memiliki batang tinggi dan menghasilan bobot per buah lebih tinggi dari genotipe pembanding, karena didukung oleh tebal daging buah tertinggi, buah yang panjang, dan diameter buah terbesar. Genotipe IPB F10-120005-141-16-35-1-4-3B, F10-120005-141-16-35-7-1-3B, F10-120005-241-2-9-4-4-1-1B, F10-120005-120-7-1-7-8-1-2B berpotensi untuk dikembangkan sebagai varietas unggul di lahan pasang surut sulfat masam potensial Sumatera Selatan, dengan produktivitas 11.38 ton ha-1 sampai 12.92 ton ha-1. Genotipe cabai keriting mempunyai kemampuan tumbuh yang berbeda di lahan pasang surut, tergantung kemampuannya beradaptasi dengan lingkungan tumbuh sesuai dengan sifat genetik yang dimiliki. Kata kunci: genotipe adaptif, genotipe pembanding, genotipe uji, lahan suboptimal