This paper reviews aspects of research on continuous soybean for the last 15 years in northeast China. Growth and development including changes of root nodule number and LAI are described, and reduction in yield and seed quality are discussed....
The seasonal dynamics of gross nitrogen mineralization, nitrification, and mineral nitrogen consumption rates were studied with the 15N pool dilute technique in burned and unburned Leymus chinensis (Trin.) Tzvel. (Chinese Wildryegrass) grasslands...
Solar radiation is an important environmental factor influencing seed yield in soybeans [Glycine max (L). Merr.]. Our objective was to analyze the response of soybean seed yield components to light enrichment initiated at different growth stages...
In the semi-arid areas of Iran, dryland crop production is limited by insufficient and inadequate rainfall distribution. Conventional tillage (moldboard plowing followed by disc harrowing) method used by farmers results in soil degradation and...
Winter cover crops are an essential part of fertility management on many northeastern farms, and cereal rye (Secale cereale) is the most widely used cover crop in this region. Rye has many advantages, including its rapid...
Nitrogen management in cover crop-sweet corn (Zea mays rugosa Bonaf.) systems is a dynamic process and requires the observation and analysis of N inputs and an assessment of the N recovery by the crop as is evidenced by the corn yield. Two years...
In spring of 2001, 12 field experiments were conducted to collect crop yield and nitrogen sufficiency data using the "end-of-season cornstalk test". This activity was possible through funding from USDA-NRCS and Massachusetts Dept. of...
Plant density has been recognized as a major factor determining the degree of competition between plants. Yield per plant decreases as the density per unit area increases. Reduction in grain yield may be the result of lower number of ears (...
The potential yield of a crop is very specific to the genotype and the environment in which it is grown. For a given genotype, the interaction of density with the arrangements of plants in the field will play a key role in determining the...
