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Long-term Missing Element Trial

Md. Mozammel Haque
Senior Scientific Officer
Address: Soil Science Division, BRRI Gazipur

Md. Abu Saleque
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

S. Kaiser Zaman
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The reverse complete treatment (NPKSZn) produced similar yield as control plot. When complete fertilizer was applied in absolute control plot, yield was increased as complete treatment irrespective of seasons. It was observed that when soil test based fertilizers were applied in 2008 T.Aman and Boro crop, overall, higher yield obtained in complete and reverse management treatment than previous T. Aman and Boro crop, 2007 except missing nutrient treatment. This higher yield obtained in Boro and T.Aman might be the role of K as responsible for higher amount in soil yet little addition of N (18kg/ha), omission of Zn and reduction of P and S dose. It was found that when addition of complete fertilizers dose in absolute fertilizer control i.e. reverse control treatment also produced the yield of both varieties and equivalent to continuously fertilized plots. The N balance was negative. About 243-917 kg N/ha appeared to have been removed in excess of the amounts added for 14 crops. The higher amount of N, 917 kg/ha was removed from the N missing plot. Large amounts of P, S and Zn accumulated in the fertilized plots. But K was removed in large amounts (247-890 kg/ha) of the added as fertilizer.

Keywords: Rice, Nitrogen, Phosphorus, Potassium, Sulfur, Zinc

Location: Bangladesh Rice Research Institute farm, Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

1. to identify the existence of limiting nutrient(s) in soil of that particular area.

Methodology:

The experiment was initiated on a permanent layout at the BRRI farm Gazipur in 1985 Boro season viewing missing element approach using 12 treatments in RCB design with 4 replications. Since Boro 2000 each plot was split to include a reverse treatment, and additional varieties, BRRI dhan29 and BRRI dhan31 to evaluate the reverse trends of missing elements. In Boro season NPKSZn @ 120-25-35-20-5 kg/ha was used but in T.Aman season it was 100-25-35-20-5 kg/ha. Again Boro and T.Aman 2008, Soil test based (STB) fertilizer were used as second modification in this experiment keeping all treatments as usual. The STB dose of NPKS was 138-10-80-5 kg ha^-1 and 100-10-80-5 kg/ha^-1. The rate was calculated from complete treatment soils after 46th crop using Fertilizer Guide-2005 (BARC, 2005) with a yield target of 7.5 t/ha and 6.5t/ha. In this STB dose, K fertilizer required more than double of previous K dose. However, Zn fertilization omitted because of its sufficiency in the soil. The unit plot size was 6 m X 7.3 m. Treatment details of the long-term missing element experiments, 1985-2009 Sl No. Original treatment Reserve treatment, 2000 1 NPKSZn All missing 2 NPSZn (-K) NSZn (+ K) 3 NKSZn (-P) NKSZn (+ P) 4 PKSZn (-N) PKSZn (+ N) 5 NSZn (-PK) NSZn (+ PK) 6 NPKS (-Zn) NPKS (+ Zn) 7 NPKZn (-S) NPKZn (+ S) 8 NPK (-SZn) NPK ( + SZn) 9 NP (-KSZn) NP ( + KSZn) 10 NK (- PSZn) NK (+ PSZn) 11 N (-PKSZn) N (+ PKSZn) 12 All missing + NPKSZn

Source of Information: Proceedings of BRRI Annual Internal Review, 2008- 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Long-term effect of complete fertilizers (NPKSZn) and missing of a nutrient from complete fertilized and unfertilized situation revealed that continuous cropping without fertilizer decreased all available nutrients including organic matter compare to initial soil of the experiment with a exception of S. Sulfur fertilization (20 kg ha^-1crop^-1) also improves the available S level in soil. Higher level of available S in control plot compared to initial soil may be due to recent conversion of industrial urbanization effect. On the other hand, P fertilization @ 25 kg ha^-1crop^-1 build up available P in soil, but when P was not applied, the available P level in soil decreased in the same way of unfertilized plot. But, incase of K fertilization @ 35 kg ha^-1crop^-1, the depletion of exchangeable K level in soil was observed. Finally, long-term missing element trial (LTE) suggests that the omission of N, P and K reduced rice yield by 2.86, 2.64 and 3.02 t/ha, respectively in BR3 and 3.40, 2.90 and 2.00 t/ha, respectively, in BRRI dhan29 at the 23rd year of the experiment. The magnitude of yield reduction in the T. Aman season was 0.60, 0.34 and 1.56 t/ha in BR11 and 0.51, 0.44, and 0.31 t/ha in BRRI dhan31 due to N, P and K, respectively. Initial six years average (1985-1990) results of grain yield indicated that the percent fertilizer contribution to total grain yield was 36 % and that of soil was 64 %. However, the fertilizer contribution to total grain yield increased to 40% over the next decade under the same fertilization system

Knowledge Management: Report/Proceedings