Investigation Tine Type Effect on Soil Fragmentation for Conservation Tillage

Year 2019, Volume: 29 Issue: 3, 548 - 558, 30.09.2019

Gholamhossein Shahgholı , Abdolmajid Moınfar

https://doi.org/10.29133/yyutbd.564789

Abstract

One of the main aims of tillage operation is to provide a seedbed with
appropriate soil fragmentation and to create relatively large aggregates of
topsoil to achieve conservation tillage. Considering that subsoiling is
necessary for hardpan breakup, the creation of a seedbed with the same
operation can increase the operation efficiency. The present study was
conducted to investigate the effect of tine type on soil aggregate. For this
purpose, we tested four subsoiling tines of conventional, Bentleg, Paraplow,
and winged-Paraplow in the field at soil moisture contents of 8, 12, 16, and
20% and the tractor forward speeds of 0.5, 1, 1.2, and 1.4 m/s. Soil
fragmentation was evaluated in different depths of 10, 20, 30, and 40 cm.
Winged-Paraplow and Paraplow, compared with two other tools, showed more soil
disturbance due to having a wing and chisel at the end of the tine. The highest
mean weight diameter (MWD) =19.9 mm was reached using a Bentleg at a depth of
10 cm and moisture content of 20%. In comparison, the lowest value of 3.37 mm
was related to the winged-Paraplow at a depth of 40 cm and moisture content of
8%.Considering the aggregate size of 0.5-8 mm for providing a proper seedbed,
the winged-Paraplow tine is a suitable tool that can provide seedbed at any
depth at a water content of 0.8PL, where PL denotes plastic limit. At slow
forward speeds, fine particles had enough time to sift to a deeper layer, which
is beneficial for seedbed creation. Reducing the soil moisture increased soil
disturbance and its fragmentation. Moreover, it was observed that MWD was
higher at high moistures..

Keywords

Mean weight diameter, Paraplow, Subsoiler tine, Soil aggregate

Supporting Institution

University of Mohaghegh Ardabili

Koruyucu Toprak İşlemesinde Dipkazan Tipinin Toprak Parçalanması Üzerindeki Etkisinin Araştırılması

Abstract

Toprak
işleme operasyonunun temel amaçlarından biri, uygun toprak parçalanmasına sahip
bir tohum yatağı sağlamak ve koruyucu toprak işlemesi için nispeten iri
agregata sahip bir üst toprak oluşturmaktır. İşlenmemiş sert toprağın kırılması
için derin sürümün gerekli olduğu göz önüne alındığında, aynı işlemle bir tohum
yatağı oluşturulması işlem verimliliğini artırabilir. Bu çalışma, dipkazan
tipinin toprak agregası üzerindeki etkisini araştırmak amacıyla yapılmıştır.
Bunun için dört toprak altı dipkazanı (Konvansiyonel, Bentleg, Paraplow ve
kanatlı Paraplow), farklı toprak nemi içeriğinde (%8, %12, %16 ve %20) ve faklı
traktör hızlarında (0.5, 1, 1.2 ve 1.4 m/s) test edilmiştir. Toprak
parçalanması, farklı derinliklerde (10, 20, 30 ve 40 cm) değerlendirilmiştir. Diğer
iki araçla karşılaştırıldığında, Kanatlı-Paraplow ve Paraplow, dipkazan sonunda
bir kanat ve keski olması nedeniyle daha fazla zemin örselenmesi göstermiştir.
En yüksek ortalama ağırlık çapına [(MWD) = 19.9 mm], Bentleg ile 10 cm derinlikte ve %20
nem içeriği kullanarak ulaşılmıştır. Bununla birlikte en düşük değer (3.37 mm), 40 cm derinliğindeki kanatlı
Paraplow ve nem içeriği %8 ile elde edilmiştir. Düzgün bir tohum yatağı
sağlamak için 0.5-8 mm agrega büyüklüğü göz önüne alındığında, 0.8P (PL=Zeminin
plastisite limiti) su içeriğinde herhangi bir derinlikte tohum yatağı
sağlayabilmede kanatlı-Paraplow dipkazanı uygun bir araçtır. Yavaş ileri
hızlarda, ince parçacıklar daha derin bir tabakaya elenmek için yeterli zamana
sahiptir; bu da tohum yatağı oluşturma için faydalı olmaktadır. Toprağın nemini
azaltmak, toprağın bozulmasını ve parçalanmasını artırmaktadır. Ayrıca, MWD'nin
yüksek nemlerde daha yüksek olduğu gözlenmiştir.

Keywords

Ortalama ağırlık çapı, Paraplow, Dipkazan, Toprak agregası

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