| The experiments were conducted by pot culture at the Biological Prevention and Cure Station, Jilin Agricultural University, in 2001-2002. The paper was designed to explore the different saline-alkali soil that came from Baicheng region of Jilin province and two main cultivated rice varieties in Jilin province. The saline-alkali soil have four levels: high saline-alkali soil is 0.645 percent of salinity content (S1); medium saline-alkali soil is 0.138 percent of salinity content (S2); low saline-alkali soil is 0.122 percent of salinity content (S3); native soil is 0.054 percent of salinity content as control. Two rice varieties are 89-45 (C1) and Nongda 10 (C2). After transplanting rice seedlings in the field, and waiting to turn green rice of seedlings, sample plants were marked card and followed the tracks of investigation dynamic growth statue of rice every 5d from turning green rice seedling. In order to study plant dry matter accumulation status in the different organ of plant, We measured plant dry weight every 15d and leaf, sheath, stern, root and other organ of each of these plant were parted individually and single measured .The samples were oven-dried. In rice main growth period, leaf chlorophyll (Ch1) content, leaf proline (Pro) content and soluble sugar content were measured on the youngest fully-developed leaves. In rice jointing-booting stage, Electrolyte leakage rate were measured. After harvest, yield components and grain yield were analyzed based on 5 pots in each treatment .At the same time, Na+, K+, Mg2+and Ca2+ content of different organ in rice were measured .The changes of ion content in soil were analyzed between unplanted rice and planted rice.The results showed that turning green times delayed 3-7d under salinity-alkalinity stress. Following the tiller numbers change, rate of decline and trends were difference from the peak tiller numbers. S1-C1 treatment and S1-C2 treatment dropped quicker than control treatment. This showed that salinity-alkalinity stress affected rice tiller capability. Tiller numbers of C1 were more than that of C2.What is more, salinity-alkalinity stress affected growth development and made the tiller grow slowly and lately, thus, some tillers became no of avail tillers. For example, there were ten tiller plants per bunch in S1-C1 treatment and seven tiller plants in S1-C2 treatment. Tiller numbers decreased by twice under S1 stress.Salinity-alkalinity stress affected dry matter accumulation in the tiller stage. As to variety C1, S1 stress treatment made rice biomass yield not reach half of control treatment, but S2 and S3 stress treatment made the rice biomass increase, even exceeded to control treatment. Thus, variety C1 has adaptation and tolerance of salinity-alkalinity stress, moderate salinity-alkalinity stress affected little on biomass yield. As to variety C2, with the development of salinity-alkalinity stress, their biomass reduced step by step. S1 treatment of biomass yield has only by 36.5 percent of control biomass. From above results made a conclusion that different salinity-alkalinity stress had different effect on tiller capability. Though S2 and S3 stress treatment had same tiller numbers of control treatment in tiller stage, higher biomass yield, salinity-alkalinity stress made nutrition deficit what led to died of tiller, reduce to avail tiller numbers, lower fertilized ears and lower grain yield.Variety with different quality character is one of the most limiting factors affecting rice plant height, but to the same variety, cultural condition can affect them. With the development of salinity-alkalinity stress, plant height became shorter than that of control treatment in the same growth stage.The same variety was planted in the different saline-alkali soil, they had the different produce capability and peak value which reached the highest dry matter yield. With the development of salinity-alkalinity stress, dry matter accumulation declined. Two rice varieties dry matter accumulation had the same trends under the same salinity-alkalin...
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