Sap nitrate in relation to tissue nitrogen and yield of 'queen' pineaaple under different fertilizers levels

Date

10-1998

Degree

Bachelor of Science in Agriculture

Major Course

Major in Horticulture

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Domingo E. Angeles

Abstract

The relationship between the following were determined: sap and tissue nitrate levels; total N with sap and tissue nitrate; and total nitrogen with yield; and the influence of the different fertilization programs on the sap and tissue nitrate and total nitrogen in the leaf of 'Queen' pineapple. The fertilization programs used were current Farmer's practice (treatment 1), PCARRD's recommendation (treatment 2) and Commercial practice (treatment 3). Sap nitrate-N was determined by Merck test strips and read in a Nitrachek, a portable reflectometer.

Sap nitrate-N increased with increasing rate of fertilization and was highest at 149.36 ppm under the Commercial fertilizer rate and lowest at 81.81 ppm under Farmer's practice. Increasing rate of nitrogen fertilization also increased tissue nitrate and total N. High correlation coefficients between sap nitrate-N and tissue nitrate (r = 0.97) and sap nitrate-N and total N (r =0.96) were obtained. Sap nitrate-N values determined using the Merck test strips were also highly correlated (r = 0.96) with portable reflectometer readings.

Fruit size also increased with fertilizer rate. Sap nitrate-N, tissue nitrate and total N at highest yield were 149.36 ppm, 1013.72 ppm, and 0.88%, respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS