Soil nutrient in two-year alfalfa field on condition of film-mulching rainfall harvesting cultivation

Abstract

Abstract: Film-mulching rainfall harvesting cultivation method was applied to alfalfa(Medicago sativa)planting on condition of dry farming, ridge was used as rainfall collection area, and furrow was used as planting area to study the effect of various ridge-furrow ratios and mulching methods on soil nutrients of two-year alfalfa fields. The result showed that no significant difference in total phosphorus (TP) contents was found among the treatments before reviving period on the second year and after the mowing of second crop in soil layers of 0 to 20 and 20 to 40 cm; accordingly, soil organic matter (SOM) and total nitrogen (TN) contents increased as the increase of ridge width for ridges covered with soil and film in the two soil layers, and within the soil layer of 0 to 40 cm, SOM, TN, available nitrogen (AN), available phosphorus (AP), slowly available potassium (SAK) and available potassium (AK) contents were found significantly higher than ridges compacted with soil and CK (conventional tillage), among all the treatments, MR60 and MR75 were found with highest soil nutrient. Compared with after mowing and before reviving, decrease of SOM from 0 to 40 cm layer in ridges covered with film was found remarkably lower than ridges covered with soil, and the increase of TN as well as the decrease of AN, AP, SAK and AK in ridges covered with film were found remarkably higher than ridges compacted with soil. According to related analysis, within soil layers between 0 to 40 cm, significant negative correlation was found between the decrease of SOM and the economic yield of alfalfa, and significant positive correlation was found between the economic yield of alfalfa and the increase of TN, the decrease of AP and AK, indicating that film-mulching rainfall harvesting cultivation inhibited the decrease of SOM effectively, and the inhibition effect of film was found better than soil, simultaneously, increase in TN content was found promoted and soil nutrient in soil layers from 0 to 40 cm was found increased, which is good to the sustainable utilization of soil.

CLC Number:

KOU Jiang-tao, SHI Shang-li, ZHOU Wan-hai, YIN Guo-li, LI Jian-wei. Soil nutrient in two-year alfalfa field on condition of film-mulching rainfall harvesting cultivation[J]. Acta Prataculturae Sinica, 2011, 20(5): 207-216.

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