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Long Term Missing Element Trial.

M A Mazid
CSO and Head
Soil Science Division, BRRI.

Abstract/ Executive Summary:

The missing element trial is an effective technique of field evaluation of the status of soils. In missing element trial a complete treatment, involving the application of the elements, which are expected to be most limiting, is used. This complete treatment is assumed to have the potential of achieving optimum crop yield under the given soil and crop management practices, while the other treatments which consist in the elimination of one or more of the elements are expected to occur nutrient deficiency after certain crop cycle which is measured through yield loss. The omission of all NPKSZn fertilizers from complete treatment (NPKSZn) drastically decreased yield than continuously fertilized complete treatment and similar extent of yield increased was observed when all NPKSZn fertilizer was applied in absolute control plot indicating that every soil needs complete addition of NPKSZn fertilization irrespective of seasons weather the plot was continuously fertilized or not. In other word, cultivated unfertilized plots either short term or long term when fertilized with equivalent amount of complete fertilizer treatment (NPKSZn @ 100/120 25-34-20-5 kg/ha) would produce nearly equal amount of paddy as continuously fertilized plots yield.

Keywords: Long term missing element, Soil fertility, Rice yield.

Location: BRRI Farm, Gazipur.

Start Date: 01-07-2004

End Date: 30-06-2005

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To asses the soil fertility for long time

Methodology:

The study was conducted at BRRI farm , Gazipur with the objective to asses the soil fertility for long time. The T. Amam 2004 crop was the 42^nd crop. Boro 2005 was the 43^rd crop on a long term basis and the reverse treatment of a particular treatment was the 8^th and 9^th crop number, respectively.

Source of Information: BRRI. Proceedings of the BRRI Annual Internal Review for 2004-2005. Bangladesh Rice Research Institute (BRRI). Gazipur -1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The yield decrease due to longer period omission of N,P, K from complete treatment and its reverse management (addition of that specific omission element) yield increase was nearly equal with little deviation of plus or minus for both varieties in both T. Aman and Boro season. But the magnitude of yield decrease or increase was higher in Boro season and Aman season. However, the yield decrease or increase due to omission of S and Zn singly or in combination these two elements were not yield limiting factor under the experimental condition.

Knowledge Management: Report/Proceedings