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Accueil du site → Doctorat → Chine → 2013 → Crushed Wheat Straw Padding Plastic Film Irrigation Research on High Efficient Water Use Mechanism and Soil Environmental Effects in the Northwest Arid Regions, China

Gansu Agricultural University (2013)

Crushed Wheat Straw Padding Plastic Film Irrigation Research on High Efficient Water Use Mechanism and Soil Environmental Effects in the Northwest Arid Regions, China

ZhangJinXia

Titre : Crushed Wheat Straw Padding Plastic Film Irrigation Research on High Efficient Water Use Mechanism and Soil Environmental Effects in the Northwest Arid Regions, China

Auteur : 张金霞; ZhangJinXia

Grade : Doctoral Dissertation 2013

Université : Gansu Agricultural University

Résumé partiel
In order to research high efficient water use mechanism and soil environmental effects of inthe northwest Arid Regions, China, a combination of mulch means and irrigation experimentswere conducted during two consecutive years of2011and2012, at Minqin Experimental Station,Gansu Hydraulic Research Institute, in Minqin city, Gansu, China. The experiments followed acompletely randomized double factors design with four coverage levels : no coverage (N), strawmulching (S), plastic film mulching (F), crushed wheat straw padding plastic film mulching (SF) ;and three irrigation quota levels : H,900m3/hm2 ; M,750m3/hm2 ; L,600m3/hm2. There are12treatments, repeating3times. The main results are as follows.(1) Mulch means significantly affected crop emergence rate (P<0.01). The experiment aboutsunflower emergence rate in2011showed that, SF was increased by14.33%with S, and49.32%with N. In2012, corn test results show that, SF was higher49.50%than S,21.36%than N. Inshort, the emergence rate with SF was close to with F, far higher than S and N. So, SF can be usedto solve the question "low emergence rate" with S in the northwest Arid Regions, China.(2) Mulching means significantly affected the sunflowers’ height, stem diameter, productionincluding its component factors, characters, harvest index in2011(P0.01) sunflowers plantedwith SF means have the widest stem diameter and the heaviest100kernel weight, and those withF means follows. However, sunflowers in plastic film mulching were the best in plant height, dryweight of root, stem and leaf, single plant biomass and grain weight, biological yield, grain yieldwhile sunflowers with F means take the second place. Irrigation quota doesn’t have a remarkablemain effect on plant height and stem diameter before the irrigation whereas it does after theirrigation. The interaction between different mulching means and different irrigation quota leveldoesn’t show a significant effect on the production and its components, characters (P0.05)while it exerts a significant effect on the harvest index. All factors including plant height, stemdiameter, production and component factors, characters, harvest index of production considered,FM, SFM are the optimal portfolios, that is plastic film mulching and M irrigation quota,crushed wheat straw padding plastic film and M irrigation quota.(3) Mulching means significantly affected the corns’ height, stem diameter, productionincluding its component factors, characters, harvest index(P0.01).The difference in mean value of stem diameter with different mulching means was very significant(P0.01), the sequence being SF S F N. The stem diameter with SF increased by2.20mm0.26mm0.93mm respectively, compared with those with N S F. There is a significantdifference between SF and N,S (P0.01) with the production of kernel being3444.72kg/hm24415.79kg/hm2higher than that with N, S respectively. The main effect of mulching means onear length, baldhead length was significant (P0.05) while the main effect on ear diameter, rowand weight was not significant (P0.05). Therefore, it can be concluded that crushed wheat strawpadding plastic film and plastic film mulching don’t have an impact corn production and itscomponent factors. The main effect of irrigation quota level on corn plant height, stem diameterand production including its component factors, characters, harvest index was not great. Theinteraction between different mulching means and different irrigation quota level did show somesignificant effect on the production and its components, characters and harvest index. Consideringthe above factors, SFM is the optimal portfolio and FM takes the second place. (4) The main effect of mulching means and irrigation quota level on water content of0 120cm soil was not significant before irrigation while significant after irrigation.

Mots clés : crushed wheat straw padding plastic film mulch; irrigation on film; high efficientwater use mechanism; soil water and heat environment; soil bulk density;

Présentation (CNKI)

Page publiée le 4 septembre 2014, mise à jour le 29 septembre 2017