The change processes of the leaf area (LA) and leaf nitrogen content (LNC) during the ripening period were analysed with 11 varieties of japonica rice.

Based on the rice genetic linkage map of 118 molecular RFLP markers, QTLs for the developmental behavior of total nitrogen content in flag leaf were determined dynamically using composite interval mapping method at five different stages.

The genetic analysis of total nitrogen and alkaloid content indicated that total nitrogen content in F_1 had over-dominant effect,and the dominance decreased with the reduction of total nitrogen content.

The variation of the amount and total nitrogen content in root system of naked oats at different growth stages was studied with two varieties, Pin-5 (late maturity) and Bayou-1(early maturity).

The results showed that different Mo concentrations could raise fresh weight (FW),dry weight(DW), chlorophyll content, Vc content and total N content of rape plants during different rape growth periods.

Study on photosynthetic capacity and leaf nitrogen content of main secondary forest-forming species in Heilongjiang Province;

It indicated that the wavelength bands related to leaf nitrogen content selected by regression equation located at 820-1100nm and 1150-1300nm.

It indicated that the spectral reflectance of wave band had significant correlation to leaf nitrogen content at 350-732,733-940 nm and 1 970-2 477 nm.