Received: 11-11-2012
Accepted: 19-02-2013
DOI:
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Research on Photosynthesis of Barnyard Grass (Echinocloa crus-galli (L.)Beauv)and Rice (Oryza sativaL.)
,
Ha Thi Thanh Binh
1
,
Vu Tien Binh
1
Keywords
Barnyard grass: Echinocloa crus-galli (L.) Beauv, photosynthesis, rice
Abstract
The pot experiment was carried out in the greenhouse to estimate the effect of different fertilizer levels on photosynthetic and physiological characters at active tillering, flowering and early ripen stage of barnyard grass (Echinocloa crus-galli (L.) Beauv) and the rice cultivar Khang dan 18 in both summer and autumn cropping seasons in 2012. Seeds of each species were sown in distinct pots containing 6 kg dry soil per pot. When rice and grass had 2 leaves, the plant was kept in single pot. There were three nitrogen levels, no nitrogen (N0), 0.1grN (N1), 0.12 grN (N2) with the same base of percentage N: P2O5 : K2O: 1: 0.5: 0.5 per one kg dry soil. The result showed that photosynthetic rate and dry matter accumulation rate of barnyard grass were higher than those of rice at all growth stages in both seasons, although stomatal conductance, transpiration rate and SPAD of rice were higher than those of barnyard grass. As increasing fertilizer, the photosynthetic rate, dry matter accumulation rate and nitrogen content in leaves were also increased in both rice and barnyard grass.
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