ISSN 2414-8245 (Online), ISSN 2518-6116 (Print)                                                              Free and Open Access



Current Issue March, 2018 (Published)
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1
EFFECT OF ENVIRONMENT AND INVESTMENT ON WINTER WHEAT PRODUCTION ON THE LOESS PLATEAU OF CHINA

Human investment and environmental changes exhibit great impacts on winter wheat production. In present paper winter wheat yield adjusted into environment yield and investment yield, to evaluate the effects of environment and investment on winter wheat production on the Loess Plateau of China. The results showed the mean value of environment yield at period IV was 851 kg/hm2, with the RE value of 25.6% and during the last 57 years the impacts of environment change on winter wheat yield were negligible. However, the climate changes, particularly fluctuations in the precipitation cycle caused the variation in winter wheat yield/year. In addition the investment yield of winter wheat at period IV was 2663 kg/hm2, with the RI value of 74.4%. Therefore, it is inferred that investment was one of the main reasons which increased winter wheat yield from 1965 to 2014 on the Loess Plateau of China; while RI values were lower during prolonged drought seasons. Consequently we conclude that the impacts of investment on winter wheat yield were limited by the environmental factors especially by rainfall on the Loess Plateau of China.
 

MUSLIM QADIR, XUECHUN WANG, ABDUL HAMEED BALOCH, YUNGAO HU, FAHD RASUL, GUOTAO YANG, SHAIKH ABDULLAH AND FATEH MUHAMMAD 1-8 Download
2
EFFECT OF WATERLOGGING STRESS AT SEEDLING STAGE ON MORPHOLOGICAL AND YIELD ATTRIBUTES OF RICE VARIETIES

An experiment was conducted during June to December, 2013 to study the effect of submergence at seedling stage  on  some  of  the  morphological  attributes  and  yield  of  some  Transplanting  aman  rice  varieties.    Four submergence duration, viz., control (no submergence), six days submergence, ten days submergence and fourteen days submergence and six varieties, viz., BRRI dhan51, BRRI dhan46, BRRI dhan34. BRRI hybrid dhan1, BRRI hybrid dhan2, ACI hybrid1 were used for this experiment. The experiment was laid out in randomized complete block design having split plot arrangement with three replications. All parameters were significantly affected by the  submergence  duration.  The  cultivars  also  significantly  varied  for  the  studied  traits.  The  tallest  plant  was recorded from fourteen days submergence treatment. The highest number grains panicle-1 and 1000-grain weight were achieved in BRRI dhan51. The highest grain yield (8.50 t ha-1) was achieved from no submergence in BRRI hybrid  dhan1  while  the  lowest  yield  (1.20  t  ha-1)  was  recorded  when  cultivar  BRRI  dhan-34  submerged  for fourteen days. The test genotypes showed wide variation in yield reduction percent comparison with control at different submergence duration. The rice cultivar BRRI dhan51 followed by BRRI hybrid dhan1 showed higher submergence tolerance and thus proved as tolerant varieties. On the other hand, BRRI dhan34 and ACI hybrid1 were susceptible to submergence.

TANIA SULTANA, KAMAL UDDIN AHAMED, NAZMUN NAHER, MUHAMMAD SHARIFUL ISLAM AND MUHAMMAD SHAHARIAR JAMAN 9-16 Download

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