A split plot experiment was conducted at Regional Research Station, CCS HAU, Uchani, Karnal during 2014–15 and 2015–16 to investigate the effect of different soil moisture regimes on antioxidative defense mechanism of sugarcane (Saccharum officinarum L.) varieties. The experiment consisted of three moisture regimes based on available soil moisture i.e. irrigation at 50% ASM, 40% ASM and 30% ASM in main plot and four commercial sugarcane varieties, i.e. CoS 767, CoH 128, CoJ 64 and Co 0238 in sub plot with three replications. The observations recorded on antioxidative defense system have suggested possible key characteristics of drought tolerance. Low ASM levels induced the antioxidative defense system by increasing ROS and the specific activities of antioxidative enzymes, viz. peroxidase, catalase and ascorbate peroxidase. Specific activity of these enzymes increased in varieties Co 0238 and CoS 767 at 60 and 90 DAP. Severe stress of 30% ASM levels also resulted in a sharp rise in total ascorbic acid content (9.36 to 13.14 mg/g), total soluble proteins (from 9.6 to 13.77 mg/g), and the increase was more in varieties Co 0238 and CoS 767. A gradual decrease was observed in all the parameters after stress revival (120 DAP). ASM levels 30% and 40% significantly reduced K+ content in leaves (2.93 to 1.83%) as compared to 50% ASM level. So, it might be concluded from this study that biochemical traits had a significant varietal variation, indicating that these parameters could be used as screening criteria for selecting the tolerant and sensitive cultivars exposed to water limiting stress.
A Field experiment was conducted during spring season of 2005-06, 2006-07 and 2007-08 to work out the agronomic practice for drought management of sugarcane during pre monsoon period. The treatments consisted of four methods of planting i.e. 60cm row spacing, 90 cm row spacing, trench planting at 120 cm distance and pit planting and four drought management practices, viz., T 1 -Control (Recommended practices of the region), T 2 -soaking of setts in saturated lime water+ KCl and urea foliar spray each at 90,105 and 120 days after planting (DAP)+ trash mulching after 60DAP+ addition of FYM@ 10t/ha in furrows before planting, T 3 -T 2 + additional potassium @ 60 kg K 2 O at first irrigation and T 4 -T 2 + additional potassium @ 60 kg K 2 O/ha at 150-180 days after planting. Highest cane and sugar yield was recorded under pit planting on pooled basis followed by 60cm, trench and 90cm spacing. There was no significant difference in shoot population, millable canes and cane yield of drought management practices plots (T 2 , T 3 , T 4 ) and normal irrigated plots (T 1 ). Combination of different technologies, viz., soaking of setts in saturated lime water, application of FYM and foliar spray of KCl and Urea proved effective in managing the sugarcane under drought conditions. Highest gross returns, variable cost, net return and B: C ratio were recorded in pit planting followed by 60cm row spacing Key words: Drought, B: C ratio, KCl, method of planting, saturated lime water Sugarcane is grown in over 4.2 million hectares in India with an average productivity of 68t/ha. Out of total area under sugarcane around 35 per cent of the area possesses nearly 100 per cent irrigation facilities while remaining 65 per cent is partially irrigated. The average yield in irrigated area is 68 t/ha while in partially irrigated area it is 41 t/ha. Thus nearly 65 per cent of area under sugarcane suffers due to water stress at some stage during its crop duration depending upon time of planting in different parts of the country. Initial establishment and tillering are the two most crucial stages for determining the yield potential of sugarcane. The limited water availability during April to July for sugarcane is one of the main reasons for low productivity. Drought accompanied with high temperature is more harmful to sugarcane growth and productivity. Efficient water management is the key factor involved in the production of sugarcane. Potassium ions regulate the opening and closing of stomata which governs the transpiration loss of water. Application of potassium have been found to increase the sugarcane growth during water stress and finally increased the cane yield (Manickam et al. 2009). Hence the present investigation was undertaken to determine the influence of different planting methods and drought management practices to manage sugarcane crop effectively under limited water supply during summer months. A field experiment was conducted during spring season of 2005-06, 2006-07 and 2007-08 at CCS Haryana Agricultural University, Regional...
A set of eighty one genotypes comprising sixty three newly developed single cross quality protein maize hybrids produced by 9 lines x 7 testers crosses along with sixteen parental inbred lines and two standard checks were evaluated for genetic variability, broad sense heritability and genetic advance at CCS, Haryana Agricultural University, Regional Research Station, Karnal, during kharif 2014. Highly significant values of mean sum of squares due to genotypes for all the 17characters studied could be recorded. Close correspondence between GCV and PCV was observed for all the traits except number of cobs per plant and cob diameter. The characters viz., number of grains per cob, tryptophan content, lysine content and grain yield per plant were recorded high estimates of heritability and genetic advance as per cent of mean indicating them to be controlled by additive genes.
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