Co-situs Application of Controlled-Release Fertilizers to Alleviate Iron Chlorosis of Paddy Rice Grown in Calcareous Soil

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概要

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• Co-situs is the placement with one application of a sufficient amount of controlled-release fertilizer for an entire growing season at any site, together with seeds or seedlings, without causing fertilizer salt injury. An experiment was conducted to find an efficient method for ameliorating Fe deficiency in two rice cultivars (cv. Tsukinohikari and cv. Sasanishiki) grown in a calcareous soil (pH 9.2, CaCO_3 384 g kg^<-1>), which was poor in organic matter (0.1 g kg^<-1>) and available Fe (3.0 μg g^<-1> soil). The field treatments consisted of co-situs application of the following fertilizers : 1) controlled-release NPK fertilizer (CRF-NPK) containing no micronutrients ; 2) controlled-release NPK fertilizer containing micronutrients (CRF-M1) ; and 3) controlled-release NPK fertilizer containing micronutrients (CRF-M2). The main difference between CRF-M1 and CRF-M2 was that the former had larger granules than the latter. All the fertilizers were placed in contact with the roots of rice seedlings at transplanting time. Plants in the CRF-M1 and CRF-M2 treatments had similar lengths, number of stems, leaf age, and leaf color (SPAD value) during the cultivation period. By contrast, plants from the CRF-NPK treatments grew poorly, showed severe chlorosis symptoms of Fe deficiency, and all died on 30 DAT. Plants of both cultivars accumulated more macro- and micronutrients with the CRF-M2 treatment than with the CRF-M1 treatment. The grain yield of cv. Tsukinohikari was 0.0, 1,910, and 2,160 kg ha^<-1> for the CRF-NPK, CRF-M1, and CRF-M2 treatments, respectively, and 0.0, 2,490, and 2,860 kg ha^<-1> for the same treatments for cv. Nihonbare. Chlorosis due to iron deficiency was successfully ameliorated and world-average grain yields were obtained with the co-situs application of both controlled-release fertilizers.

• 社団法人日本土壌肥料学会の論文

著者

• Mori S

  Laboratory Of Plant Biotechnology Graduate School Of Agricultural And Life Sciences The University O

• Matsuhashi S

  Takasaki Advanced Radiation Research Institute Japan Atomic Energy Agency

• Mori S

  Dept. Of Appl. Biol. Chem. Univ. Tokyo

• Mori Satoshi

  Lab Plant. Mol. Physiol. Tokyo Univ. Fac. Pharmaceutical. Science. Nagoya City Univ.

• Mori S

  Department Of Applied Biological Chemistry The University Of Tokyo

• Morikawa C.

  Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporati

• Saigusa M.

  Field Science Center, Tohoku University

• Nakanishi H.

  Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporati

• Nishizawa N.

  Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporati

• Hasegawa K.

  Ishikawa Agricultural College

• Mori S.

  Graduate School of Agricultural and Life Sciences, University of Tokyo

• Mori S

  Meijo Univ. Aichi Jpn

• Saigusa M

  Okayama Univ. Okayama

• Saigusa M.

  Field Science Center Graduate School Of Agricultural Science Tohoku University

• Nishizawa N

  Dep Appl Biol Chem Univ Tokyo

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