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Sun Y.-Y.,Institute of Plateau Meteorology | Sun Y.-Y.,Sichuan Agricultural University | Sun Y.-J.,Sichuan Agricultural University | Sun Y.-J.,Ministry of Agriculture Key Laboratory of Crop Physiology | And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2012

Hybrid rice Chuanxiang 9838 with medium shade-endurance was taken as the test material to investigate the effects of different sowing dates and low-light stress at heading stage on the flag leaf photosynthetic rate (Pn), osmotic regulators, antioxidant enzyme activities and the grain yield of hybrid rice. Sowing date and low-light stress at heading stage had significant effects on the flag leaf Pn and antioxidant enzyme activities and plant dry matter accumulation at heading stage and the grain yield. With the delay of sowing date, the whole period of rice growth and development shortened notably, and the grain yield decreased to different degrees.compared with the control, shortterm slight low-light stress (20% shading) at heading stage could relieve the harms from high temperature and strong light, and further, relieve the decrease of flag leaf Pn and plant dry matter accumulation at heading stage, adjust the flag leaf antioxidant enzyme activities, and moderately improve the seed setting rate. However, short-term medium low-light stress (40% shading) and serious low-light stress (60% shading) were not beneficial to the rice growth. Correlation analysis indicated that the flag leaf Pn, malondialdehyde (MDA) content, and superoxide dismutase (SOD) were more sensitive to the sowing date and low-light stress at heading stage, and there existed a highly significant positive correlation between the flag leaf Pn at initial heading stage (1-5 d) and the plant dry matter accumulation at late heading stage and grain yield. Source


Xu M.,Sichuan Agricultural University | Song C.,Sichuan Agricultural University | Song C.,Ministry of Agriculture Key Laboratory of Crop Physiology | Dai W.,Ministry of Agriculture Key Laboratory of Crop Physiology | And 4 more authors.
Chinese Journal of Applied Ecology | Year: 2015

Field plot experiment was carried out to study the effect of phosphorus application on soil phosphorus adsorption-desorption characteristics under three cropping patterns including maize/ soybean relay intercropping (M/ S), maize monoculture (M), and soybean monoculture (S). Results showed that without phosphorus fertilization, the system crop yield under M/ S was increased by 9.8% and 79.1% compared with that of M and S, respectively, and the land equivalent ratio (LER) was 1.58. With phosphate fertilizer application, the system crop yield under M/ S was increased by 10.4% and 80.3% compared with that of M and S, respectively, and the LER was 1.62. The system crop yields under M/ S, M and S with phosphate fertilizer application were increased by 12.7%, 12.2% and 17.6%, respectively, compared with that without phosphorus fertilization. Among three cropping patterns, the soil buffer capacity (SBC) values were in the order of M/ S>M >S regardless of phosphate fertilizer applied or not. The SBC values of M/ S, M and S without phosphate fertilizer application were reduced by 19.6%, 30.3% and 12.0% compared with phosphate fertilizer application treatments, respectively. The soil desorption per absorption (b) values of the three cropping patterns with phosphate fertilizer application were in the order of M/ S>M>S, and the b values increased by 10.9%, 39.1% and -9.6%, respectively, compared with non phosphate fertilizer application. The soil phosphorus maximum absorption (Qm) and soil phosphorus desorption rate also showed the same trend. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source


Yong T.-W.,Sichuan Agricultural University | Yong T.-W.,Ministry of Agriculture Key Laboratory of Crop Physiology | Liu X.-M.,Sichuan Agricultural University | Liu X.-M.,Ministry of Agriculture Key Laboratory of Crop Physiology | And 12 more authors.
Chinese Journal of Applied Ecology | Year: 2014

A field experiment with three N application rates (0, 180, 240 N kg·hm-2, representing zero, reduced and conventional N application, respectively) and three planting patterns (maize monoculture, soybean monoculture and maize-soybean relay strip intercropping) was conducted to reveal the effects of cropping patterns and N application rates on yield, nutrient uptake and nitrogen use efficiency of maize and soybean. The results showed that the grain yield, N, P and K uptake and harvest index of the intercropped maize reduced slightly compared with the monoculture maize, however these indices of the intercropped soybean increased significantly compared with the monoculture. With the increase in nitrogen fertilizer application, the excellence of relay strip intercropping was weakened in the maize-soybean intercropping system. The grain yield, economic coefficient, N, P and K uptake, harvest index, N agronomy efficiency and N uptake efficiency of maize and soybean increased significantly at the reduced nitrogen rate (180 N kg·hm-2), but the rate of soil N contribution declined, compared with the conventional rate of N application by local farmers (240 N kg·hm-2). In the reduced nitrogen rate treatment, total soil N and P contents of the maize strip reduced, whereas the total soil N, P and K contents of soybean strip and the total K content of maize strip increased compared with the zero N application treatment. With the reduced N application, the annual total grain yield, N, P and K uptake of above-ground biomass in the maize-soybean relay strip intercropping system were higher than in the monoculture, and the land equivalent ratio (LER) was 2.28. N uptake efficiency of maize in the relay strip intercropping system was 20.2% higher than in the maize monoculture, and the index of soybean was 30.5% lower than in the monoculture. The rate of soil N contribution in the relay strip intercropping system was 20.0% and 8.8% lower than in the maize and soybean monoculture, respectively. The reduced N application in the maize-soybean relay strip intercropping system was helpful to promote annual grain yield and improve N utilization efficiency. Source

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