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NITROGEN REQUIREMENTS OF SUGARCANE VARIETIES UNDER DIFFERENT SOIL MOISTURE REGIMES

Rehman, Altaf-ur (1995) NITROGEN REQUIREMENTS OF SUGARCANE VARIETIES UNDER DIFFERENT SOIL MOISTURE REGIMES. PhD thesis, Sindh Agriculture University, Tando Jam.

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Abstract

Field experiments were conducted at the Sugar Crops Research Institute, Mardan during 1990 1992 to study the response of sugarcane varieties CP 65/357, CPM 13 and CP 75/1353 to varying N levels viz. 0.50, 100, 150 and 200 kg / ha under different irrigation Schedules based upon 40%, 60% and 80% depletion of available soil moisture (ASM). The results revealed that nitrogen fertilization significantly increased the yield and yield contributing characters like number of tillers, millable canes, cane thickness, plant height, number of internodes per stalk, internode length and number of leaves per plant. Conversely, it had an adverse effect on the quality characters like brix degree, POL%, purity % and CCS% during both the years. Almost all the morphological characters of sugarcane showed positive correlation as well as linear regression with the various levels of nitrogen applied, while juice quality was negatively correlated with nitrogen fertilization. However, the increasing levels of nitrogen application consistently increased the cane and sugar yields upto 150 kg N/ha there after it did not prove so much advantageous. The yield and yield attributes of sugarcane progressively increased with successive decrease in depletion and showed negative correlation and linear regression with this factor while, juice quality was improved with the increase in depletion of ASM and showed positive correlation and linear regression with depletion of ASM. Maximum cane and sugar yields were obtained with irrigation scheduled at 40% depletion of ASM. The varietal response was significantly different for almost all the characters studied during both the years. Among the varieties, CP 75/1353 proved its superiority by producing highest cane and sugar yield whereas; variety CP 65/357 exhibited the least results in this respect during both the years. Nitrogen fertilization showed significant interaction with different depletion of ASM for most of the characters studied. An application of 200 kg N/ha under 40% depletion of ASM gave the best results for almost all morphological characters, while quality parameters were diminished with the combination of higher levels of nitrogen and lower depletion level of ASM. Varieties differed significantly in their response to various doses of nitrogen applied in respect of most of the characters studied. The variety CP 75/153 showed good response to nitrogen fertilization while variety CP 65/357 exhibited the lowest response in this respect during both the years. Varieties differed markedly in their tolerance to different soil moisture stress regimes with regard to different morphological characteristics. The variety CP 75/1353 again gave maximum cane and sugar yields under different level of soil moisture, whereas variety CP 65/357 gave the poorest results in this respect during both the study years. There was a differential varietals response to nitrogen fertilization under varying soil moisture stress regimes. The variety CP 75/1353 had a great genetic potential for better utilization of nitrogen fertilizer and available soil moisture. While CP 65/357 showed the poorest response to nitrogen and available water for optimum utilization in respect of all the characters studied during both the years.

Item Type:Thesis (PhD)
Uncontrolled Keywords:Nitrogen, Sugarcane, Sugar Yield, Cane, Cane Juice, Cp 65/357, Cpm 13, Cp 75/1353, Available Soil Moisture (Asm), Tillers, Millable Canes, Cane Thickness, Plant Height, Number Of Internodes, Degree, Pol%, Ccs%, Juice Quality,
Subjects:Agriculture & Veterinary Sciences(a) > Agriculture(a1)
ID Code:283
Deposited By:Mr Ghulam Murtaza
Deposited On:17 Jun 2006
Last Modified:04 Oct 2007 21:00

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