The comparison of system of rice intensification, Leaf Color Chart-based Nitrogen Management, and Growth Stage-based Nitrogen for Yield and ROI

Issue Date

12-2010

Abstract

Grain yield and return on investment of SRI component technologies comprising of manual rotary weeding, commercial organic fertilizer (COF), WIDER PLANT SPACING (30 cm x 30 cm), use of younger seedlings (8 days old), and alternate wetting and drying were compared to conventional crop management systems that utilized the Leaf Color Chart-based Nitrogen Management (LCC-NM) and Growth Stage-based Nitrogen Management (GS-NM), both using 21-day old seedlings, standard plant spacing of 20cm x 20 cm, recommended pesticides, and continuous flooding with optimum water level. The treatments were (1) SRI 1 = applied the recommended 20 bags haˉ¹ of COF 1 week before transplanting (WBT), saturated soil condition throughout the growing period; (2) SRI 2 = applied 60 bags haˉ¹ of COF 1 WBT, saturated soil condition throughout the growing period, and (3) SRI = applied 20 bags haˉ¹ of COF 1 WBT, and irrigated when soil cracked; (4) LCC-NM = N fertilizer was applied based on LCC readings, basal application of phosphorus (P) and potassium (K) fertilizers; and (5) GS-NM = N fertilizer was applied at mid-tillering (MT), early panicle initiation (EPI) and flowering (F), and basal application of P and K fertilizers. In 2005 to 2008 dry seasons for rice variety PSB Rc82, the three SRI treatments showed significantly lower average grain yields (3.1 - 3.3 t haˉ¹) than LCC-NM (6.9 t haˉ¹) and GS-NM (7.1 t haˉ¹). In 2005 to 2008 wet seasons, the three SRI treatments had likewise lower grain yields (3.5- 3.7 t haˉ¹) than LCC-NM (6.1 t haˉ¹) and GS-NM (6.0 t haˉ¹). The previously reported high yields from SRI technology were not attained in this study. SRI, particularly with wider plant spacing and elevated levels of COF, had lower tiller, panicle, and spikelet number mˉ² and hence lower grain yield than LCC-NM and GS-NM that utilized the standard plant spacing and inorganic N fertilizers with high efficiency. SRI had lower return on investment than LCC-NM and GS-NM due to lower grain yield and net income.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

35

Issue

3

Page

50-56

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, pictures

Language

English

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