| Rubber tree (hevea brasiliensis) is a long-term crop and a lot of mineral nutrients will take away duration its growth and latex tapping. Application of high eddicient mineral nutrient utilization planting materials not only reduces fertilizer and production cost but also decrease pollution of fertilizing. Some superior rubber tree seedlings, superior plants, which could efficiently use the nutrients of different N, P and K nutrient contents in sand culture were preliminarily screened out in our previous experiments were use as materials to study its plant growth and chracteristics of mineral nutrient utilization in the soil of different nutrient conditions to further improve the techniques of rubber tree efficient nutrient utilization plant selection. The results as follows:1. The growth performance of the superior plants growing the different nutrient conditionsGrowing in different soil nutrient conditions, there were differences among varieties of superior plants in growth. Growing in poor soil conditions, the stem diameter of GT1, RRIM600, PR107N superior plants were bigger than that of the controls. Meanwhile the height of PR107N superior plants were also higher than that of the controls. Stem diameter, height and leaf-umbrella distance of PR107N superior plants were less than that of growing general soil cultivation. In poor soil conditions, stem diameter and height increment of RRIM600P superior plants were larger than that of controls. In general soil conditions, stem diameter, leaf-umbrella distance of PR107P superior plants were greater than that of the controls. In poor soil conditions, PR107P superior plants stem diameter, plant height were less than that of the controls, but leaf-umbrella distance were greater than that of the controls. Stem diameter, plant height, and the growth of leaf-umbrella distance of GT1、PR107P superior plants were less than that of in general soil.2. The impact of different soil nutrient conditions on the superior plants leaf SPAD value and chlorophyll fluorescence parametersGrowing in different soil nutrient conditions, the superior plants leaf SPAD value varied significantly among different varieties. In poor soil conditions, the leaf SPAD value of RRIM600N superior plants were greater than that of the control, the leaf SPAD value of PR107N superior plants were decreased. In both soil nutrient conditions, the leaf SPAD value of PR107P superior plants were larger than that of the controls. In poor soil conditions, GT1, PR107P superior plants leaves SPAD value were less than that of in general soil.Growing in different soil nutrient conditions, chlorophyll fluorescence characteristics of superior plants were significantly different among different varieties. GT1, RRIM600, PR107N superior plants of photosynthetic capacity, activity, light damage and other energy dweresipation were less than that of the control. Other energy dweresipation of GT1N superior plants were very significantly less than that of the control. In poor soil conditions, maximum fluorescence, variable fluorescence, photosynthetic capacity, activity of GT1N superior plants were decreased, the ability to adjust the excess light energy and other energy dweresipation were increased. Photosynthetic capacity, activity of GT1, RRIM600, PR107P superior plants were greater than that of the control. Other energy dweresipation, light damage were less than that of the control; fluorescent potential, photochemical efficiency, the ability to obtain energy of GT1P superior plants were greater than that of the control, the Light injury, other energy Dweresipation to extremely significant less than that of the control, light energy ability to obtain of PR107P superior plants were greater than tha t of the control. In poor soil conditions, fluorescent potential, the ability to obtain energy photosynthetic capacity, activity, and PSII photochemical efficiency of GT1, PR107P superior plants were decreased. Light damage and other energy dweresipation wrer increased.3. The impact of different soil nutrient conditions on superior plants leaf nutrient contentGrowing in different soil nutrient conditions, the leaf nutrient content of superior plants varied significantly among different varieties. In general soil conditions, leaf total N, P content of PR107N superior plants were greater than that of the control. In poor soil conditions, leaf total N, P content of PR107N superior plants were decreased. In poor soil conditions, of RRIM600P superior plants Leaf total P content were more than that of the control strain, leaf P content of GT1, PR107P superior plants were less than that of in general soil.4. The effects on soil nutrients of the land of planting the superior plantsIt is different from among the superior plants that the effect on soil nutrient of growing different superior plants. The consumption of nitrate, ammonia nitrogen by growing GT1, RRIM600, PR107N superior plants from the poor soil were less than that of the control. Consumption of nitrate and ammonia nitrogen by planting GT1RRIM600PR107N superior plants from the poor soil were significantly higher than that of from the general soil meanwhile consumption of available P was significantly lower than that of from the general soil. The consumption of soil nitrate by planting GT1, RRIM600PR107P superior plants from the barren land were significantly higher than that of the general soil and consumption of available P was significantly lower than that of from the general soil.In summary, GT1, RRIM600PR107N superior plants could be more efficient use of nitrate and ammonium nitrogen in the soil, and partially keep its growth superiority in the experiments; and GT1, RRIM600, PR107P superior plants only shew some growth superiority. The primary selected N superior plants preliminarily shew the characteristics of higher efficient use of nitrogen, and the selected P superior plants could not efficiently use phosphorus. |
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