Climate change causes change in rainfall patterns, which will affect water availability. Water is a limiting factor for rice production on dry land. Increasing rice yields on dry land requires precise water management. This study aimed to investigate the effect of supplementary irrigation when it does not rain on rice yields in dry land during rainy season. The research was conducted on dry land in Playen, Gunung Kidul, Daerah Istimewa Yogyakarta, Indonesia during rainy season of November 2020 to February 2021. The treatments were supplementary irrigation if 1 day without rain (A1), if 2 days without rain (A2) and if 3 days without rain (A3), and they were compared to control without supplementary irrigation (A0). This research used a randomized completely block design, each treatments replicated 4 times. The results showed A1 gave the highest grain yield, namely 7.786 ton ha−1, significant different with other treatments of A2, A3 and A0. Dry straw of A1 was 7.324 ton ha−1, significant different with A2, A3 and A0. Carbon absorption of A1 was 6.860 ton ha−1, consisting of carbon in grain 3.575 ton ha−1 and straw 3.285 ton ha−1, it was significant different with other treatments of A2, A3 and A0 (p<0.05; n=16). B/C A2 1.73 was highest from the others and its farmers have profit Rp. 19,276,360 ha−1.
Permintaan bawang merah yang meningkat membutuhkan terobosan teknologi peningkatan produktivitas, termasuk di tanah vertisol. Penelitian ini bertujuan untuk mengetahui pengaruh dosis pupuk kandang sapi terhadap pertumbuhan dan hasil True Shallot Seed di tanah vertisol. Penelitian dilaksanakan di Desa Plembutan, Kapanewon Playen, Kabupaten Gunung Kidul pada September-Desember 2021 dengan menggunakan Rancangan Acak Kelompok Lengkap (RAKL) faktorial 3 ulangan. Faktor Pertama adalah dosis pupuk kandang sapi (T); T1 = 10 ton/ha; T2 = 20 ton/ha; dan T3 = 30 ton/ha. Faktor kedua adalah Varietas (V): V1 = Maserati, V2 = Lokananta, dan V3 = Sanren. Parameter pengamatan adalah tinggi tanaman dan jumlah daun 3, 5 dan 7 mst, bobot segar dan bobot kering oven 6 mst, serta produktivitas. Data dianalisis dengan anova dan DMRT 5%. Hasil penelitian menunjukkan dosis pupuk kandang sapi tidak nyata berinteraksi dengan varietas TSS pada semua parameter. Peningkatan dosis pupuk kandang sapi nyata berpengaruh terhadaap jumlah daun 7 mst, bobot segar tanaman 6 mst, tetapi tidak nyata berpengaruh terhadap tinggi tanaman 3-7, jumlah daun 3 dan 5 mst, bobot kering oven 6 mst dan produktivitas. Produktivitas bawang merah yang terbaik diperoleh pada dosis pupuk kandang sapi 30 ton/ha. Varietas TSS nyata mempengaruhi tinggi tanaman 3-7 dan jumlah daun 7 mst, bobot segar dan bobot kering oven 6 mst, tetapi tidak nyata pada jumlah daun 3 dan 5 mst dan produktivitas. Produktivitas tertinggi pada varietas Lokananta, diikuti Sanren dan Maserati.
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