Field validation of fertilizer recommendation and correlation analysis of quantitative and qualitative results of analytical services laboratory and soil test kit: evaluation of varying levels of chemical fertilizers on the growth and yield of lowland rice under acidic and alkaline soils

Date

2023

Abstract

The high demand of rice can be supplied by intensive cultivation of problematic rice production area including alkaline and acidic soils which requires the use of large quantities of chemical fertilizers to attain the full potential of high yielding rice variety. One of the alkaline soils in the Philippines is found in Rizal particularly in Binangonan and one of the acidic soils is identified in Cavinti, Laguna [Philippines]. The influence of fertilizer recommendations on the growth and yield of lowland rice (RC 214) was determined in Binangonan Series in Barangay [village] Darangan in Binangonan, Rizal [Philippines] as a representative for alkaline soils. A profile characterization was done to validate the actual condition of the area. Under the acidic condition, six treatments were used laid out in a randomized complete block design (RCBD) with three replications. The recommended rate was 120-60-60. In all the parameters (plant height, tiller count and straw yield) measured at active tillering and at harvest, application of twice the recommended rate of inorganic fertilizer gave high results, but not significantly different from full recommended rate and one and one-half recommended rate inorganic fertilizer. Plots with no fertilizer and farmer's practice consistently gave low results. Based on the correlation analysis, there was a positive correlation between the rate of fertilizer recommendation and grain yield (r sup 2=0.68). In alkaline soils, application of twice the recommended rate of chemical fertilizer showed significant affect on the growth of lowland rice in terms of plant height for both stages (active tillering and maximum tillering). The application of the full recommended rate chemical fertilizer increased the number of tiller following three split applications which produced more tillers that the farmer's practice at active and maximum tillering stages. However, the treatments did not show any significant difference for straw yield. The application of twice the recommended rate of chemical fertilizer produced significantly heavier 1000 seeds, longer panicles and higher percent filled grain. Split application and all at once application (Farmer's Practice) of the full recommended rate of chemical fertilizer showed no significant difference in terms of yield parameters (seed weight, panicle length and percent filled grain) although there was a tendency for split application to produce higher values compared with farmer's practice. In terms of grain yield, application of twice recommended rate of chemical fertilizer produced the highest grain yield but treatments with full recommended rate and 1 1/2 recommendation rate were not significantly different. The correlation analysis showed that the growth and yield parameters of rice are positively correlated with the grain yield than the growth parameters. The grain yield and rate of inorganic fertilizer followed a linear relationship with an r sup 2 value of 0.8955. The equation that can be used to predict the amount of yield produced by a certain amount of fertilizer based on the results of the experiments is presented by Y=7.1802 + 1.6919X.

Language

English

Document Type

Article

Pages /Collation

44 leaves

En – AGROVOC descriptors

RICE; ORYZA SATIVA; PLANT PRODUCTION; FERTILIZERS; SOIL PH; ALKALINE SOILS; FERTILIZER APPLICATION; CROP YIELD; APPLICATION METHODS; APPLICATION RATES

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