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Integrated Nutrient Management for Potato-t.aus-t.aman Rice Cropping Pattern

D. A. Choudhury
On-Farm Research Division, BARI, Gazipur

A.N.M. Mamun
Regional Spices Research Centre, BARI, Gazipur

M. M Ahmed
On-Farm Research Division, BARI, Gazipur

F. Islam
SFFP, DAE, Dhaka

M. M. Alam
0n-Farm Research Division, BARI, Comilia

Abstract/ Executive Summary:

The experiment was conducted at farmers' field of Chandina, Comilla during 1997-98 to 1999-2000 to develop a suitable combination of inorganic and organic fertilizers for Potato- T.Aus-T.Aman cropping pattern. Different combinations of NPKS and organic manure were tested. The local farmers' fertilization practices and a no fertilizer treatment were also included for comparison. The highest tuber yield of potato was recorded from soil test based (STB) fertilizer doses for high yield goal along with cowdung. Application of cowdung (CD) along with STB inorganic fertilizer increased about 30% yield than the STB alone. No appreciable yield loss occurred due to reduction of 33% of PKS in succeeding T.Aus and T.Aman rice indicating the beneficial residual effect of fertilizer applied to the preceding crop. The highest gross margin was obtained from STB along with CD application in Potato and when 66% PKS + full dose of N was applied in subsequent rice crops. The partial net balance of N was negative in all cases, P balance was also negative in some fertilized plots particularly where reduced amount of P was applied in 2^ndand 3^rdcrops. The K balance was also negative except in farmers' practice. In farmers practice a quite large amount of P (122 kg/ha) and K (29 kg/ha) accumulated every year due to excessive fertilization in potato.

Keywords: Soil fertility, Integrated nutrient management, Potato-T.Aus-T.Aman rice pattern

Location: Chandina, Comilla

Start Date: 00-00-1997

End Date: 00-00-2000

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To observe the effect of chemical fertilizers along with organic manures and its subsequent effect on the succeeding crops in Potato-T.Aus-T.Aman cropping pattern.

Methodology:

The experiment was conducted at farmers' field of Chandina, Comilla during 1997-98 to 1999-2000 to develop a suitable combination of inorganic and organic fertilizers for Potato- T.Aus-T.Aman cropping pattern. Five treatments viz. absolute control (T ₁), fertilization following BARC fertilizer recommendation for medium yield goal (T ₂), Soil test based fertilizer recommendation for high yield goal (T₃), T₃ + application of cowdung (T ₄) and farmers' fertilization practice (T ₅) were applied for the 1st crop of the pattern. For the 2nd (Kharif-D and 3rd crop (Kharif-Il), treatment T ₃ was divided into 4 sub-plot and treatment T ₄ was divided into 2 sub-plots. The sub-plots received reduced fertilizer doses in order to study the residual effect of the fertilizers applied to the 1st crop. The potato variety "Diamant" was planted at the rate of 1500 kg seed/ha in last week of November with a spacing of 60 x 20 cm. Fertilizers were applied as per treatment. The crop was harvested in 3^rd-4^th week of February. Thirty day old seedlings of BR 26 (T.Aus) were transplanted in 3^rd - 4^thweek of April with a spacing of 20 x 20 cm. All PKSZn were applied as basal but N was applied in three equal splits at seedling (10-15 DAT), tillering (25-30 DAT and at 45-50 DAT. Weeding and other intercultural operations were done as and when necessary. The crop was harvested during 3^rd^-4^thweek of July. Thirty day old seedlings of BRRI dhan-32 (T.Aman) were transplanted in 1^stweek of August with a spacing of 20 x 20 cm. All PKSZn were applied as basal but N was applied in three equal splits at seedling (10-15 DAT, tillering (25-30 DA T) and at 45-50 DA T. Weeding and insecticides were sprayed twice. The crop was harvested during 2^ndweek of November. Different data on yield and yield parameters were collected as per requirement and plot yield was determined from a 5 m² harvest area. All the data were analyzed statistically following MSTAT. Fresh tuber weight of Potato and dried stover was considered for potato. Moisture content was estimated by using moisture meter and grain yield of rice was adjusted at 14% moisture content. Straw yield was taken as oven dried basis. Crop nutrient uptake was estimated using the standard value (BARC, 1997).

Source of Information: Bangladesh Agron. J. 2005, 11(1 & 2): 17-23, ISSN 1013-1922

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

About 15% potato yield was increased due to application of inorganic fertilizer along with cowdung over inorganic fertilizers alone. At least 30% of recommended PKS can be reduced in succeeding T.Aus and T.Aman rice if potato is grown with full dose of inorganic fertilizers with 5 t/ha of cowdung. Traditionally the farmers' use a very high amount of inorganic fertilizer in potato and a considerable amount of P and K accumulated every year. That will be a great concern for sustainable crop production in future. Organic manure should at least be applied in one crop of the pattern and a reduced amount of inorganic fertilizer should be applied in subsequent crops for sustainable productivity.

Knowledge Management: Journal