0564-3929
1964 Issue 2
..............page:107-119
yu jiang xian shui dao tu shi yong lin fei xiao guo chu bao
W. S. CHANG;S. Y. CHEN;C. Y. FAN;K. C. Yü AND T. H. CHIANG
W. S. CHANG;S. Y. CHEN;C. Y. FAN;K. C. Yü AND T. H. CHIANG
..............page:213-215
..............page:164-171
..............page:143-154
zhi wu gen xi xi shou tu rang zhong li zi de tu jing
liu zuo yu ;
liu zuo yu ;
..............page:235-242
..............page:222-229
tu rang zhong you ji kuang zhi jiao ti rong he de yan jiu . you ji kuang zhi fu he ti de wu li hua xue te xing
WU MEI-LING AND MA YI-CHE
WU MEI-LING AND MA YI-CHE
..............page:196-205
shui dao tu de li xue xing zhi yu shui fen han liang de guan xi
C. J. JAW AND P. K. Lü
C. J. JAW AND P. K. Lü
..............page:132-142
tu rang dian hua xue xing zhi de yan jiu . hong rang jiao ti de dian he te zheng
CHANG SHIAO-NIAN AND CHIANG NENG-HUI
CHANG SHIAO-NIAN AND CHIANG NENG-HUI
..............page:120-131
shui dao tu zhong yang hua huan yuan guo cheng de yan jiu . luo he tai di tie de ce ding
BAO HüO-MING;LIU CHI-KUANG Yü TIEN-JEN
BAO HüO-MING;LIU CHI-KUANG Yü TIEN-JEN
..............page:216-221
..............page:155-163
..............page:192-195
..............page:172-182
xi sha zhi jin sha tu shui yan shang sheng yun xing de chu bu yan jiu
HSIA CHIA-CHI AND WANG GEN-CHEN
HSIA CHIA-CHI AND WANG GEN-CHEN
..............page:206-212
..............page:230-234
qiang suan xing yan zi shui dao tu de fa sheng
The strongly acid salty paddy soils derived from noncalcareous allitic sediment are widely distributed in the estuary of Chu-Kiang of Kwangtung province. Before recent sediments have deposited;the whole areas were densely covered by mangrove populations. A buried layer of decomposed products from residual plants is often underlaid at varied depth of present soil profiles. This layer contains large quantities of sulphide compounds. Oxidation of sulphides under acid conditions during dry period results the formation of sulfuric acid;which reacts with the kaolinitic clay to form aluminium sulfates. Periodical floodings of sea water add salinity of the soil and upon hydrolysis of the aluminium sulphate give a strongly acid reaction. The toxicity of the soil is mitigated with the increasing thickness of overlaid sediments. However;large areas of strongly acid salty soil with underlaid organic matter layer less than 25 cm below the sulface appear very harmful to rice growth. Reclamation of the soil can be accomplished by: a) irrigation of river water;b) keep the soil in a permanent moistened condition;c) liming;and d) addition of surface soil.
The strongly acid salty paddy soils derived from noncalcareous allitic sediment are widely distributed in the estuary of Chu-Kiang of Kwangtung province. Before recent sediments have deposited;the whole areas were densely covered by mangrove populations. A buried layer of decomposed products from residual plants is often underlaid at varied depth of present soil profiles. This layer contains large quantities of sulphide compounds. Oxidation of sulphides under acid conditions during dry period results the formation of sulfuric acid;which reacts with the kaolinitic clay to form aluminium sulfates. Periodical floodings of sea water add salinity of the soil and upon hydrolysis of the aluminium sulphate give a strongly acid reaction. The toxicity of the soil is mitigated with the increasing thickness of overlaid sediments. However;large areas of strongly acid salty soil with underlaid organic matter layer less than 25 cm below the sulface appear very harmful to rice growth. Reclamation of the soil can be accomplished by: a) irrigation of river water;b) keep the soil in a permanent moistened condition;c) liming;and d) addition of surface soil.
..............page:183-191