Water Relations at the Initial Sugarcane Growth Phase Under Variable Water Deficit

Abstract

This study aimed to quantify water deficit levels that compromise sugarcane initial growth exposed to different availability soil depths. The experiment was conducted in a greenhouse by using 100-liter capacity asbestos-cement boxes filled with different soil layers simulating depths of 10, 20, 30, and 40 cm. Water deficit levels were represented by accumulated reference evapotranspiration of 0, 40, 80, 120, 160, 200, 240, and 280 mm, which was considered from planting to irrigation return. Soil moisture at field capacity at planting time was sufficient to promote sprouting and emergence regardless the water deficit level that was subsequently exposed. For soil depths of 10 and 20 cm, a 160-mm water deficit level caused total plant death. On the other hand, for soil depths of 30 and 40 cm, a 200-mm water deficit level promoted plant death. A water deficit level from 40 mm significantly reduced plant growth regardless soil depth.

Association of Physiological Responses and Root Distribution Patterns of Ratooning Ability and Yield of the Second Ratoon Cane in Sugarcane Elite Clones

“…In a related study, the date of first irrigation after planting significantly affected sprouting percentages, in which the best sprouting was obtained when the sets were irrigated at planting [16]. The application of a superabsorbent polymer into the sandy soil improved soil moisture content, and increased germination and early growth of sugarcane genotypes [17].…”

Water Demand Analysis of Sugarcane Based on Crop Simulation Model (Case Study: Kediri Regency, East Java)

“…Jumlah air tanah yang diserap oleh tumbuhan kemudian digunakan untuk fotosintesis dan menghasilkan pertambahan biomassa (CB) yang disimpan di bagian tertentu. Pertambahan biomassa bervariasi setiap hari tergantung pada proses fotosintesis yang terjadi dan ketersediaan air (Ghannoum, 2016;Mauri et al, 2017).…”

“…Informasi kebutuhan air tanaman dapat menjadi bahan pertimbangan dalam pemberian irigasi pada waktu-waktu kering tanpa mempengaruhi pertumbuhan tanaman dan hasil produksi (Mauri et al, 2017). Teknologi dan aplikasi irigasi dapat dilakukan bervariasi terhadap kondisi iklim selama masa pertumbuhan tanaman tebu.…”

“…Hal ini dapat disebabkan pertumbuhan pesat akibat ketersediaan air tanah yang tinggi di awal pertumbuhan dapat mengurangi hasil tebu saat mengalami defisit. Hasil penelitian Mauri et al (2017) menunjukkan pertumbuhan biomassa dapat berkurang di fase pertunasan saat mengalami defisit air meskipun saat fase awal pertumbuhan kebutuhan air sudah tercukupi. Produktivitas tebu yang mengalami potensi cekaman air ada pertengahan fase memiliki produktivitas paling rendah (da Silva et al, 2013).…”

Desenvolvimento inicial da cana-soca sob lâminas de irrigação de salvamento

“…Nestas usinas, irriga-se a cana-soca logo após a colheita, em tempo de espera (Lead Time) em torno de 20 dias, estádio este definido como o qual a cultura mais necessita de água para seu desenvolvimento inicial (brotação e perfilhamento). De acordo com Mauri et al (2017), o déficit hídrico nas primeiras fases pode acarretar o comprometimento do desenvolvimento do sistema radicular e baixo perfilhamento, resultando, portanto, em baixo aproveitamento da água e dos nutrientes disponíveis nos períodos posteriores.…”