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Effect of Npk and Nematode Inoculum on Root-knot Disease Incidence and Some Yield Parameters Contributing to Yield of Sugarcane and Recovery of Sugar

M. Iqbal
Bangladesh Sugarcane Research Institute, Ishurdi, Pabna, Bangladesh.

M. U. Ahmad
Professor
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh

I. Hossaln
Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh

I. H. Mian
Department of Plant Pathology, Bangabandhu Sheikh Mujibar Rahman Agricultural University (BSMRAU) Salna, Gazipur

Abstract/ Executive Summary:

An experiment was conducted to find out the effect of different NPK combinations and nematode inoculum on root-knot disease incidence and yield of sugarcane. The number of galls and female root-knot nematodes ranged from 1.3-5.0 and 1.4-5.4 respectively per gram of roots under different combinations of NPK. Significantly higher number of galls and mature females of root-knot nematodes were found in plant fertilized with N alone as compared to all other treatments. The treatments K alone and P+K gave the least population (1.4 nos./g root) of nematodes. Non- inoculated canes gave significantly higher numbers of leaves, roots, tillers, millable canes, length of internodes, weight of canes and recovery of sugar than those of inoculated canes under different N, P and K treatments. Nematode inoculated infected canes showed comparatively low sugar recovery of 6.85% than the non- inoculated healthy canes which showed 8.44% recovery of sugar. Besides, number of roots, length of internode, and height of cane and girth of cane showed significant negative correlation with the galling incidence under different fertilizer treatments. On the other hand, length of roots, girth of cane, weight of millable canes and number of millable canes also showed significant negative correlations with number of female rootknot nematodes.

Keywords: Effect, NPK, Root-knot, Sugarcane.

Location: Ishurdi, Pabna

Start Date: 01-01-1999

End Date: 30-06-2001

Program Area: Pest Management

Commodity: Sugarcane

Objectives:

To find out the effect of NPK and nematode inoculum on root-knot and yield of sugarcane.

Methodology:

A pot experiment was conducted to find out the effect of NPK and nematode inoculum on root-knot development, plant growth and yield parameters of sugarcane during 1999-2000 and 2000-2001. The soil was sterilized with formalin (40% formaldehyde) @ 30 ml formalin dissolved in 1000 ml water for per cubic feet of soil. The treated soil was covered with polythene sheets and kept for 72 hours. Then the polythene sheets were removed and the soil was spread in thin layer on the pucca floor for 7 days. Earthen pots were used. Each pot was filled with 12 kg sterilized and dried soil. An earthen plate was placed below each pot to retain excess fluids. Urea, TSP and MP @ 280, 180 and 120 kg/ha were applied as recommended for sugarcane. Urea, TSP and MP were applied for N, P and K respectively in different combinations viz. N, P, K, NP, NK, PK and NPK. Entire amount of TSP was applied at planting. One third of urea and one third of MP were applied as first top dressing after 20 days of planting. The rest two third of urea and MP were applied in two splits as top dressing after 45 days and 90 days of the first application of urea and MP. The experiment was conducted in a split plot design with four replications. Eight fertilizer treatments were tested in sub-plots and the nematode inocula were tested in whole plots. Three sets each of 32 plots (40 cm dia) were used in the experiment. All the three sets of pots were filled with sterilized soil and one month old settling of the sugarcane variety Isd 16 was transplanted in each pot. The pots with settling were watered regularly for normal growth of the cane. When the plants were established, the soil of the pot around the base of the plant was loosened with the help of a "Nirani" from time to time. Weeding and mulching were done every alternate fortnight up to harvest of the plants. To enhance the growth and root development, the settlings were fertilized in three instalments as cited earlier. Each pot received 3.5 g urea, 2.25 g TSP and 1.5 g MP at the rate of 280, 180 and 120 kg/ha of urea, TSP and MP, respectively. After 45 days of transplanting, a set of 32 pots (four for each treatment) were inoculated with 20 eggmasses collected from tomato roots and brinjal roots previously inoculated with single eggmass of root-knot nematode. These 32 pots were used for recording data on galling incidence and population of root-knot nematodes. Another set of 32 pots (four for each treatment) was similarly inoculated to record data on different growth and yield parameters. Another set of 32 pots (four for each treatment) was used as control (without inoculum). Data were collected on tiller number, number of galls and eggmass, population of nematodes, number and length of leaves per plant, number of millable canes, growth of cane, height of cane, length of internode, weight of millable canes, weight and length of root and recovery of sugar.

Source of Information: BANGLADESH JOURNAL OF SUGARCANE, Vol. 29, pp. 48-55, July 2007, ISSN- 1991-8925.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the present study concluded that number of roots, length of internode, and height of cane and girth of cane showed significant negative correlation with the galling incidence under different fertilizer treatments. On the other hand, length of roots, girth of cane, weight of millable canes and number of millable canes also showed significant negative correlations with number of female rootknot nematodes.

Knowledge Management: Journal