8 research outputs found
The screening process and results for literature from the 1970s to the 1990s.
<p>The screening process and results for literature from the 1970s to the 1990s.</p
Relationships between wheat yield and soil organic matter, total nitrogen, alkali-hydrolysis nitrogen, available phosphorus and available potassium in the Weibei region of Shaanxi province.
<p>*Significance level: P<0.05.</p
Variations of yields for wheat and maize at the farmers' level in different regions of Shaanxi province (error bars show standard deviations).
<p>Variations of yields for wheat and maize at the farmers' level in different regions of Shaanxi province (error bars show standard deviations).</p
Relationships between N rates and total nitrogen, N rates and alkali-hydrolysis nitrogen, P<sub>2</sub>O<sub>5</sub> rates and available phosphorus and K<sub>2</sub>O rates and available potassium on wheat plots in the Weibei region of Shaanxi province.
<p>**Significance level: P<0.01.</p
Variations of soil organic matter, total nitrogen, alkali-hydrolysis nitrogen, available phosphorus and available potassium in different regions of Shaanxi province (error bars show standard deviations).
<p>Variations of soil organic matter, total nitrogen, alkali-hydrolysis nitrogen, available phosphorus and available potassium in different regions of Shaanxi province (error bars show standard deviations).</p
Variations of soil nutrient balance on wheat and maize plots in different regions of Shaanxi province.
<p>Variations of soil nutrient balance on wheat and maize plots in different regions of Shaanxi province.</p
Variations of PFP of fertilizer on wheat and maize in the different regions (kg kg<sup>−1</sup>).
<p>Variations of PFP of fertilizer on wheat and maize in the different regions (kg kg<sup>−1</sup>).</p