Establishment of sampling techniques and standard sap NO₃-N in Banana using the rapid nitrate test

Issue Date

12-2007

Abstract

Rapid nitrate test using the Merkoquant test strip was applied to diagnose the nitrogen requirements of 'Lakatan banana. The study was conducted to establish the sampling procedures, determine the standard sap NO₃-N level and determine its sensitivity to predict the plant's nitrogen needs. Sap NO₃N did not vary significantly along the petiole and midrib and therefore, any of their sections can be used as index tissue for sap analysis. Bihourly changes of sap NO₃-N level were noted, but the highest level was obtained at 9:30 AM. The standard sap NO₃-N level of 390 ppm was established from a survey of bananas grown in Laguna, Batangas, Tagaytay City and Davao City. Validation trials to determine whether or not the standard sap NO₃-N level can accurately predict yield showed negative results.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

32

Issue

3

Page

69-79

Document Type

Article

Frequency

tri-quarterly

Physical Description

8 tables

Language

English

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