Physiological Studies on Ratoonability of Sugarcane Varieties under Tropical Indian Condition

Abstract

<span style="color:black;">The ratoon crop occupies approximately 40% of the total area of sugarcane crop in tropical India. The main reason for the lower average cane productivity is the yield decline in ratoon crops (40</span><span style="color:black;"> - </span><span style="color:black;">50</span><span style="color:black;"> </span><span style="color:black;">t/ha) despite the release of the high yielding varieties and advanced cane production technology.<span> The physiological factors associated with ratooning per</span></span><span style="color:black;">formance and the variation in growth and yield were studied in 11 sugarcane varieties in two cycles of one plant and two ratoon crops each.</span><span style="color:black;"> The first ratoon and second ratoon crop showed 17.0% and 28.1% reduction in tiller production and 15.5% and 15.7% reduction in NMC, respectively, over plant crop. The differences in growth parameters between the plant and ratoon crops at the formative phase were lesser than that of grand growth and maturity phases. Varieties Co 86032, Co 97008, Co 95020 Co 99004 and Co 2000-10 showed better physiological efficiency in terms of plant height, shoot population, leaf size, TDMP, partitioning efficiency, chlorophyll content and nitrate reductase activity and significantly higher yield components such as NMC, SCW, cane length, internodal length as well as cane yield com</span><span style="color:black;">pared to other varieties. The higher reduction in ratoon yield in Co 99008, Co 94012, Co 8021 and Co 97009 (>35.00% reduction) was due to higher reduction in tiller production associated with stunted plant growth and root system, reduce</span><span style="color:black;">tion in individual leaf size and LAI, TDMP, total chlorophyll content, NMC, internodal length and SCW. The results obtained indicated that the plant height, TDMP, stem partitioning, leaf size, total chlorophyll content, SCW, cane length and cane girth were highly associated with yield of first and second ratoon crops than that of plant crop. Therefore the difference in the association between physiological parameters with yield of plant and ratoon crops therefore decides the ratooning potential of the crop.</span><span style="color:black;"></span

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

“…Environmental factors greatly affect the ratooning ability and yield of the ratoon crop [13,14]. The germinating bud is initially dependent on the nutrients and water in the set, developing its own root system after about three weeks under proper conditions [15].…”

Evaluasi Klon-Klon Tebu Potensial di Lahan Kering

“…Soomro et al (2012dan Rehman et al (2014 menyatakan hasil hablur ditentukan oleh produktivitas tebu dan rendemen. Hasil penelitian Gomathi et al (2013) memperlihatkan perbedaan hasil hablur sebagai akibat perbedaan genetik tanaman yang digunakan.…”

Pertumbuhan, Produktivitas dan Hasil Hablur Klon Tebu Masak Awal-Tengah di Tanah Inceptisol

“…Panjang ruas batang tebu dipengaruhi oleh interaksi genetik tanaman dan kondisi lingkungan (Junejo et al, 2010). Hasil penelitian Gomathi et al (2013) menunjukkan bahwa perbedaan varietas tebu menghasilkan perbedaan panjang ruas batang.…”