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Gansu Agricultural University (2010)

Study on Nitrogen and Phosphorus Supply and Utilization Under Completely Mulched Alternating Narrow and Wide Ridges with Furrow Planting of Maize in Semi-arid Area

Wang Jia

Titre : Study on Nitrogen and Phosphorus Supply and Utilization Under Completely Mulched Alternating Narrow and Wide Ridges with Furrow Planting of Maize in Semi-arid Area

Auteur : Wang Jia

Grade : Master’s Theses 2010

Université : Gansu Agricultural University

Résumé
In this paper, coated corn as the research object, the new membrane treatment dew horizon for (NM), semi-the membrane flat (HM), the whole film flat (CM) and film double furrow sowing (CMRF) four processing, year dual-use film processing set no-till established crop (NTSS), three processing the zero tillage legislation stalk (NTMS) and NTS (NTMC), a total of seven treatment. Different coating and straw stubble spatial and temporal changes in soil nitrogen, nitrate nitrogen and total phosphorus and maize plants nitrogen, phosphorus absorption, accumulation and translation. Aims to understand and grasp the full film double furrow sowing corn nutrient absorption and accumulation and soil nutrient dynamics law, reasonable to promote the whole film double furrow sowing cultivation techniques provide a scientific basis, reveal the inner mechanism of its high yield. The main findings are as follows : coating processing corn root growth to provide a better environment factor, film double furrow sowing treatment of deep nutrient absorption capacity of the strongest, the absorption of different coating 0 60cm phosphorus in corn than the impact was not significant. Coating processing, from July to August, the whole film processing 40 60cm soil nitrogen absorption strongest, the whole growth of the whole film double furrow sowing to deal with the greatest impact on the 110cm below the soil nitrogen. NTS highest total nitrogen and total phosphorus content in the straw are. The film double furrow sowing handle the whole growth period at 20 40cm total phosphorus decline 0.255g/kg, significantly greater than the other treatments, 110 to 140cm soil total phosphorus each treatment to push forward with the growth period was irregular slow decline decline to full film double furrow sowing treatment (0.152g/kg). The spatial variation of the total nitrogen phosphorus showed a trend of \The whole growth period film double furrow sowing 0 60cm soil nitrogen absorption the than highest, processing between 0 60cm soil phosphorus absorption than the difference was not significant. 2 film double furrow sowing treatment to promote the accumulation of nitrate in soil. Corn whole growth period of processing each 0-40cm soil nitrate content changes significantly with soil depth, content weakened by outside influences ; each 0-200cm soil the overall nitrate content in June 10 July 10th highest, the lowest in 10 September to 10 October ; May 10 to August 10 each gradually decreased with soil depth, soil nitrate content, September 10 to October 10 was fluctuated reduced the differences in surface and deep soil nitrate content decreases ; October 10 full film double furrow sowing handle 0-200cm soil nitrate content overall than other treatments ; straw and stubble treatment quite nitrate content of each treatment, and the change is not regular. Corn whole growth of different variations of the depth of soil nitrate content in 0-20cm layer ; minimum 140-200cm depth. The 3 film processing and straw mulch treatment can significantly promote plant nitrogen, Phosphorus cumulative. Crop nitrogen, phosphorus nutrient content decreased with the prolongation of the growth period, aboveground nutrient accumulation in overall increasing trend. Lu horizon for processing each processing corn nitrogen, phosphorus nutrient accumulation dynamic curve of the \The corn nitrogen and phosphorus nutrients accumulated peak, the cumulative capacity of the nitrogen in the August 5 the largest phosphorus until October 5 to the maximum. Film double furrow sowing treatment under the corn kernel N and P content was significantly greater than the other treatments, legislation the stubble and legislation stalk treatment did not increase the effect of corn grain nitrogen and phosphorus nutrients accumulated. Full film processing nitrogen, phosphorus harvest index was significantly higher than other treatments, the straw of nitrogen, phosphorus harvest index was not significantly more residual ; film processing corn plant N, nitrogen use efficiency and no-till established crop and no-till straw mulch treatment difference is not significant, phosphorus utilization efficiency of membrane treatment was significantly greater than straw ; film double furrow sowing process with mulching, nitrogen, phosphate fertilizer use efficiency was significantly greater than the other treatments, straw NTS processing nitrogen, phosphate fertilizer use efficiency is also the highest.

Présentation (Dissertationtopic)

Page publiée le 28 avril 2013, mise à jour le 2 avril 2018