Studies On Soil Suitability Of Brazilian Upland Rice IAPAR9

To explore the effects of different soil conditions on Brazilian upland rice's growth process and dry matter production and its soil suitability a field experiment was conducted with the treatments of five main soil types, i.e Red soil derived from Quaternary red clay,calcareous purple soil , Red soil derived from slate, alluvial soil, limestone, the results were as follows.(1) The Brazilian upland rice IAPAR9 grew best in the condition of Red soil derived from Quaternary at the early stage growth, but grew best at the late stage in the condition of the calcareous purple soil and limestone .The Brazilian upland rice IAPAR9 in the condition of the red soil derived from slate' s leaf emerging velocity was the first, 0.139 piece /day ,but it was the slowest in the condition of alluvial soil, only 0.120 piece/day .Because the-vegetative growth of the Brazilian upland rice IAPAR9 in the condition of the limestone was delayed, their life period were 125 and 122 days, respectively, longer than other treatments. The greatest LAI of the Brazilian upland rice IAPAR9 in the condition of Red soil derived from Quaternary red clay was reached, and amounted to 9.053, which was higher than other treatments obviously.(2) The highest percentage of dry matter accumulation of the Brazilian upland rice IAPAR9 in the conditions of all soils was in the middle stage. The percentage of dry matter accumulation in the late stage of the Brazilian upland rice IAPAR9 in the condition of the calcareous purple soil, limestone, alluvial soil was more than their percentage of dry matter accumulation in early stage, but the Brazilian upland rice IAPAR9 in the condition of Red soil derived from Quaternary red clay and Red soil derived from slate were in reverse. Except for in the condition of the calcareous purple soil, the highest NAR of the Brazilian upland rice IAPAR9 gained in its early stage in the condition of other four soils. The highest CGR in its early and middle stage was reached in the condition of Red soil derived from Quaternary redclay, and in the late stage was in the condition of the calcareous purple soil .The total N, P and K accumulation of the Brazilian upland rice IAPAR9 was the most in the condition of Red soil derived from Quaternary red clay, but the transport ratio of total N, P and K was the most in the condition of the calcareous purple soil.(3) Red soil derived from Quaternary red clay benefited tillering of Brazilian upland rice best. The highest ear-bearing percentage of the Brazilian upland rice IAPAR9 was in the condition of the alluvial soil. The economical yield of the Brazilian upland rice IAPAR9 in the condition of calcareous purple soil was the highest, amounted to 4525.23kg/hm2, and that next were in the conditions of Red soil derived from Quaternary red clay, red soil derived from slate and alluvial soil, respectively, the lowest was in the condition of limestone, which was only 2379.23kg/hm2. But the highest biological yield of the Brazilian upland rice IAPAR9 was in the condition of Red soil derived from Quaternary red clay, the lowest was in the condition of the alluvial soil .The correlation analysis showed that the economical yield was correlated with number of thei first rachis negatively at the level of Po.oi(r=-0.957 ), and the economical yield was correlated with the seed-setting positively at the level of PO.OS (r=0.685 ).(4)Although the stem and leaf of the Brazilian upland rice IAPAR9 in the condition of Red soil derived from Quaternary red clay grew best, and the dry matter accumulation was the highest, the economical yield was not the highest; The dry matter accumulation of the Brazilian upland rice IAPAR9 in the condition of calcareous purple soil was in the middle, and the harvest index, the economical yield were the highest. Therefore, it was inferred from the above results that the Brazilian upland rice was planted most suitably in the calcareous purple soil area, then was in Red soil derived from Quaternary red clay area. We should take the efficient measures to increase t...