Differential Responses of Azolla to Phosphorus Deficiency : I. Screening Methods in Quantity Controlled-Condition
スポンサーリンク
概要
- 論文の詳細を見る
Azolla growth in the fields is often limited by phosphorus supply. A screening technique for Azolla to grow and fix N_2 more efficiently under P-deficient conditions was developed in water culture experiments using 3 species of Azolla under quantity-controlled conditions. Azolla was grown with a P supply ranging from 0.17 to 13.9 μg・cm^<-2>・day^<-1>. At a P supply lower than 1.39 μg・cm^<-2>・day^<-1>, Azolla became deficient in P with tissue P contents lower than 0.2-0.25%. Growth, N content, and N_2 fixation decreased with the decrease in the P supply. Under P-deficient conditions, Azolla pinnata var. pinnata #7001 and A. pinnata var. imbricata #5 showed lower P contents, grew better, and fixed a larger amount of N_2 than A. mexicana #2026 and A. microphylla #4018. the ratio of N_P in the tissues was also higher in A. pinnata. At a P supply higher than 1.39μg・cm^<-2>・day^<-1>, A. microphylla #4018 exhibited a better growth and N_2 fixation than the other strains. The growth responses of different Azolla strains to P deficiency at a P supply of 0.174 gcm^<-2>day^<-1> were similar regardless of the inoculation with P-starved or enriched Azolla. From the third week, when P deficiency symptoms appeared, A. pinnata strains produced a larger amount of biomass and fixed a larger quantity of N_2 than the Euazolla section species (one A. mexicana and five A. microphylla strains). Biomass was harvested weekly and either half or the fixed quantity of biomass was inoculated. By the repetition of this procedure, biomass production approached a steady state. Both methods gave a similar ranking for the strains in terms of growth under P-deficient conditions.
- 社団法人日本土壌肥料学会の論文
著者
-
Kushari D
Burdwan Univ. West Bengal Ind
-
Kushari D.p.
Department Of Botany Burdwan University
-
Watanabe Iwao
The International Rice Research Institute
関連論文
- Differential Responses of Azolla to Phosphorus Defficiency : II. Screening Method under Concentration Controlled Conditions
- Differential Responses of Azolla to Phosphorus Deficiency : I. Screening Methods in Quantity Controlled-Condition
- DIFFERENCE IN NATURAL ABUNDANCE OF ^N IN SEVERAL RICE (Oryza sativa L.) VARIETIES : APPLICATION FOR EVALUATING N_2 FIXATION
- EFFECT OF PHOSPHORUS ON N_2-FIXATION AS MEASURED BY THE FIELD ACETYLENE REDUCTION TECHNIQUE IN THAILAND LONG-TERM FERTILITY PLOTS
- GROWTH INHIBITION DUE TO CONTINUOUS CROPPING OF DRYLAND RICE AND OTHER CROPS
- GROWTH OF AZOLLA IN PADDY FIELD AS AFFECTED BY PHOSPHORUS FERTILIZER
- QUANTITATIVE STUDY ON NITRIFICATION IN FLOODED RICE SOIL
- Mineralization of Azolla N and Its Availability to Wetland Rice : I. Nitrogen Mineralization of Different Azolla Species as Affected by Their Chemical Composition
- DYNAMICS OF AVAILABLE NITROGEN IN PADDY SOILS : II. Mineralized N Of Chloroform-Fumigated Soil as a Nutrient Source for Rice
- Sexual Hybrids of Azolla filiculoides with A. microphylla
- INORGANIC NITROGEN MOVEMENT IN TROPICAL SOILS : II. The Fate of Ammonium Fertilizer in Well and Poorly Drained Soils in the Rainy Season
- SEASONAL CHANGE OF N_2 FIXING RATE IN RICE FIELD ASSAYED BY IN SITU ACETYLENE REDUCTION TECHNIQUE : II. Estimate of Nitrogen Fixation Associated with Rice Plants
- INVOLVEMENT OF NEMATODES IN THE SOIL SICKNESS OF A DRYLAND RICE-BASED CROPPING SYSTEM
- Difference in Survival of Uptake Hydrogenase Positive and Negative Strains of Bradyrhizobium japonicum in Flooded and Non-Flooded Soil
- DRY SEASON SOIL CONDITIONS AND SOIL NITROGEN AVAILABILITY TO WET SEASON WETLAND RICE
- INORGANIC NITROGEN MOVEMENT IN TROPICAL SOILS : I. Nitrification and Nitrogen Loss in Poorly Drained Soil during Rainy Season
- SEASONAL CHANGE OF N_2-FIXING RATE IN RICE FIELD ASSAYED BY IN SITU ACETYLENE REDUCTION TECHNIQUE : I. Experiments in Long-term Fertility Plots
- IMMOBILIZATION, MINERALIZATION AND AVAILA-BILITY TO RICE PLANTS OF NITROGEN DERIVED FROM HETEROTROPHIC NITROGEN FIXATION IN FLOODED SOIL