Long-term nitrogen management strategies based on straw return improve soil carbon and nitrogen fractions and nitrogen use efficiency of maize in the Tumochuan Plain Irrigation District.

3 Results 3.1 Soil available nutrients As shown in Table 2 , year, straw return, and nitrogen application rate all had highly significant effects on the contents of soil alkali-hydrolyzable nitrogen (AN), available phosphorus (AP), and available potassium (AK).

also in 132,142 other papers

In contrast, PFPN showed an increasing trend as nitrogen input decreased.

also in 63,971 other papers

Regardless of whether straw was returned, all fractions exhibited a decreasing trend with the reduction in nitrogen application rates.

also in 47,180 other papers