萬頃江流域 논 土壤의 微量要素診斷과 亞鉛 및 鐵이 水稻生育에 미치는 影響 = Studies on Diagnosis of nicronutrient Status in Mangyeong River Area and Nutritional Effects of Zinc and Iron on Rice Growth
저자
權泰午 (圓光大學校 大學院 農學科)
발행기관
학술지명
권호사항
발행연도
1986
작성언어
Korean
KDC
041
자료형태
학술저널
수록면
401-447(47쪽)
제공처
소장기관
A series of experiments was carried out to get basic data for diagnosis of micrountrient status to determine any possible nutrient problems in rice prodnction in paddy soils of the Mangyeong River Area. The contents of Zn, Cu , Mn, and Fe in 66 paddy soils were determined with DTPA-TEA, pH 7.3 The Zn content of the 18 selected soils was partitioned into five fractions. An evaluation of 11 chemical methods for determining soil Zn was conducted to select the most reliable tests. Investigations were also conducted to characterize the nutritive effects of applied Zn and Fe on growth and chemical composition of rice plants.
The results obtained are summarized as follows.
1. The Zn and Cu contents in soils varied from 0.67ppm to 7.00ppm(mean 1.84 ppm). and from 0.87ppm to 4.00ppm(mean 1.92ppm), respectively. About 23% of the soils tested. contained lower Zn content than" critical value" tentatively proposed by results below. But the Cu content of all the soils seemed to be adequate for rice production.
2. The Mn and Fe contents in soils varied from 0.7ppm to 45.0 ppm (mean 11.6 ppm). and from 200ppm to 800 ppm(mean 510 ppm), respectively. Most of the soils(95%) contained adequate level of Mn, but Fe contents of the soils seemed to be very excess for rice production.
3. Higher contents of Zn, Cu, Mn and Fe in soils were found in fluvio-marine deposits than in alluvium and local alluvium soils. In general, in-land soils containded higher amounts of Zn, Cu, Mn and Fe than the soils near river-bed area.
4. The micronutrient contents of soils were negatively related to soil reaction(pH) and phosphourus content of soils. but positively related to organic matter content. C.E.C., and clay content of soils.
5. The Zn content of 18 selected soils was partitioned into the five fractions: The total Zn varied from 23.13ppm to 78.08ppm with mean of 55.20ppm. The 18 soils contained an average of 0.05, 0.33, 1.87, 3.07, and 94.68 per cent of the total Zn in water-soluble, exchangeable. chelated, organic and residual mineral Zn fractions, respectively.
6. Significant positive relationships were found between clay content and total Zn, and residual mineral Zn. The organic Zn was significantly related to chelated Zri, "available" Zn, residual mineral Zn, SiO₂ content and organic matter content of soils. A negative relationship was found between Fe content and exchangeable Zn.
7. Multiple regressions consisting of total Zn in combination with Fe or Mn content significantly increased the predicability of "available" Zn in soils. The results indicate that "available" Zn was affected by total Zn positively and Fe or Mn content negatively.
8. Extractabilities of soil Zn was very different among eleven extractants. The highest content of Zn was extracted by 0.1 N HCl(30min.) and the lowest was extracted by IN NH₄0Ac, pH 4.8.
9. Applied Zn significantly increased Zn, Mn, Ca and Mg contents, but decreased Fe, Cu, and Na content in rice plants at 40 days after transplanting. The K content in rice plants was not significantly influenced by applied Zn.
10. The DTPA-TEA, pH 7.3, 0.lN HCl(5min.), double acids. 1N NH₄0Ac, pH4.8 extractable Zn were significantly related to dry matter production of rice plants at 40 days after transplanting. No significant relationship was found between any extractable Zn and Zn content and Zn uptake by rice plants.
11. Highly significant multiple correlation coefficients. R = 0.543*- 0.632,** were found between every 11 extractable Zn in combination with Fe. The results revealed that rice yield was increased by Zn content but decreased by Fe content of soil at the same time.
12. The "critical" Zn contents of 0.1N HCl (1 min), 0.05N HCI, IN NH₄OAc, pH 4.8, DTPA-TEA. pH 7.3 and double acids were 1.2, 1.2, 0.6, 1.0 and 2.0 ppm respectively.
13. Significant interactions between applied Zn and Fe were observed on grain yield. and Zn and Fe content in rice plant.
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