Effect of nitrogen application on reconstruction of nitrogen compounds during the maturation stage in several field crops

Abstract

The effect of nitrogen application on the process of nitrogen distribution and retranslocation during the maturation stage was investigated in the field for rice, spring wheat, maize, soybean and potato.

Effect of nitrogen source and light conditions on14C-behavior of14C-[U]-sucrose,14C-[U]-asparagine, and14C-[U]-serine introduced to leaf of rice and sorghum plants

“…Therefore, it is unlikely that the nitrogen metabolism was affected by the nitrogen nutritional level. These results support the findings previously reported showing that the co~position of the amino acid pool in each organ was stable regardless of N, P, or K deficiency (Shinano et al 1990), nitrogen application rate (Shinano et al 1991b) or growth stage (Shinano et al 1991a, b). Nitrogen nutrition may affect mainly the quantity of nitrogenous compounds in the plant.…”

Nitrogen Utilization in the Supernodulating Soybean Variety “Sakukei 4” and Its Parental Varieties,“Enrei” and “Tamahomare”

“…This is a process of self-destruction, because the N demand of soybeans during the seed fi lling stage is the highest of all crops. The total N accumulated in seeds corresponds to N transfer , the N accumulated in nonreproductive organs (all organs except for seeds) until the start of seed maturation (R5 stage) and then translocated to the seeds, plus the N absorbed from soil and fixed by nodule from the air during the seed fi lling and maturation Shinano et al, 1991). The N-redistribution ratio (NRR), which is the ratio of N transfer to N R5 (N that had accumulated in non-reproductive organs at the start of seed maturation, R5 stage), was lower in Sakukei 4 and Tamahomare, and N-contribution ratio (SNCR), the ratio of N transfer to N seed , (N of the seeds at harvest), was highest in En1282 and lowest in Sakukei 4 (Table 2).…”

Nitrogen effect on amino acid composition in leaf and grain of japonica rice during grain filling stage

“…There exists disagreement on the changes in amino acid composition of proteins in leaves and grains in response to N fertilizer. Shinano et al (1991) investigated the variations of FAA and PAA under N treatments. They found some kinds of FAA like Cys in leaves decreased with N level, whereas in the harvesting organs, the composition of FAA did not change appreciably with increase of N level.…”