Comparative Studies On Mechanism And Effects Of Different Cultivations On Yeild And Quality Of Rice

Four different treatments were compared relative to their effects on amino acid and protein contents of brown rice, rice yield and the activities of some key enzymes of nitrogen and carbon metabolism(i.e., NR, GOT, Proteolytic enzyme, SPS, ADPG-PPase) in functional leaves and grain of 4 rice varieties. The cultivation of 4 treatments were conventional cultivation, high-protein and high-yield cultural integrative technology system of rice (composite cultivation), amended composite cultivation I and amended composite cultivation II. The main results were shown as follows:1. Compared with conventional cultivation, amended composite cultivation I could obviously strengthen the activities of NR, Proteolytic enzyme, SPS in functional leaves, the activities of ADPG-PPase in grain and the activities of GOT in functional leaves and grain of rice, which showed that amended composite cultivation I was stronger in absorption and assimilation of nitrogen and in transferring amino. It has higher efficiency in carbohydrate which yielded by photosynthesis to convert to cane sugar. The starch composition efficiency is higher too. It is favorable to high product, high contents of protein and amino acid breed of rice.2. Compared with amended composite cultivation II, composite cultivation and conventional cultivation, amended composite cultivation I could obviously improve the rice yield, the contents of protein and the protein yield. The yield of early rice(5767 kg/hm2) increased by 4.55% , 6.15%and 13.81%, increased by 2.95%, 5.31% and 9.23% for later rice (6108 kg/hm2), respectively. The total N contents (19. 63 g/kg), protein N contents (19. 32 g/kg) of early rice and total N contents (18. 80 g/kg), protein N contents (17.80 g/kg) of late rice were converted into gross protein contents and protein contents, the gross protein in brown rice of early rice increased by 0.24, 3.87 and 16.96 g/kg, the protein contents increased by 0.24, 4.70 and 17.08 g/kg. The gross protein in brown rice of late rice increased by 5.00, 7.85 and 18.98 g/kg, the protein contents increased...