• Title/Summary/Keyword: Crop analysis

Search Result 3,047, Processing Time 0.042 seconds

A Meta-Analysis for the Impact of Transgenic Crop Adoption on Corn and Soybean Yield

  • Lee, Sang-Hoon;Lee, Gyeong-Bo;Hwang, Seon-Woong;Kim, Hye-Jin;Chung, Doug-Young
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.45 no.4
    • /
    • pp.614-621
    • /
    • 2012

  • Although there is a broad dispute over genetically modified foods on safety, the worldwide adoption of transgenic crops is rapidly increasing. The objectives of this study were to identify trends in the effects of transgenic on crop yields and examine the effect of agricultural variables including crop type, biotech trait, tillage system, and yield environment on corn and soybean yield. A meta-analysis from the 34 peer-reviewed scientific literatures was conducted to compare the crop yield between transgenic crops and conventional varieties. Results showed that the yield of transgenic corn and soybean was strongly dependent on growing conditions. Transgenic hybrids had higher yield potential in the low crop yield environments such as high weeds and/or insect infestation, low soil water, and cool temperature conditions, while transgenic crops did not have yield advantages in high yield environments. The results from this study suggest that producers should consider the potential yield environmental conditions and possible yield reductions when producers choose crop hybrids in their fields.

  • https://doi.org/10.7745/KJSSF.2012.45.4.614 인용 PDF KSCI

Minimization of Crop Length by Sizing Press in Hot Rolling Mill (열간 조압연 공정에서 2단 사이징 프레스에 의한 크롭 최소화)

  • Heo, S.J.;Lee, S.H.;Lee, S.J.;Lee, J.B.;Kim, B.M.
    • Transactions of Materials Processing
    • /
    • v.17 no.8
    • /
    • pp.619-626
    • /
    • 2008

  • In this study, design methodology to determine optimal shape of the anvil in sizing press process has been proposed to minimize crop length of the AISI 1010 slab in horizontal rolling after width reduction. Shape of anvil were selected to 12 cases by design of experiment, and the dog-bone shapes and the crop length were determined by FE-analysis. Also, the anvil shape, which has minimum crop length, were determined by artificial neural network(ANN). As a result of FE-analysis, it can be seen that the crop length was increased with increasing center thickness in the dog-bone shape after width reduction. The anvil shape which has minimum crop length, was estimated to ${\theta}_{1}=21^{\circ}{\theta}_{2}=14^{\circ}$ by FE-analysis and ANN.

  • https://doi.org/10.5228/KSPP.2008.17.8.619 인용 PDF KSCI

Construction of core collection based on single nucleotide polymorphism analysis in soybean germplasm

  • Jeong, Namhee;Park, Soo-Kwon;Lee, Choonseok;Ok, Hyun-Choong;Kim, Dool-Yi;Kim, Jae-Hyun;Park, Ki-Do;Moon, Jung-Kyung;Kim, Namshin;Choi, Man Soo
    • Proceedings of the Korean Society of Crop Science Conference
    • /
    • 2017.06a
    • /
    • pp.106-106
    • /
    • 2017

  • The soybean [Glycine max (L.) Merr.] is one of the most important crop resources worldwide as food and forage. It is also important and valuable that to hold crop resources to have high genetic diversities. Recently, a core collection has been constructed in many plants to preserve the genetic resources of various plants. A core collection is small population to represent the genetic diversity of the total collection, and is of strategic importance as they allow the use of a small part of a germplasm collection that is representative of the total collection. Here, we developed the core collection consisting of 816 accessions by using approximately 180,000 (180K) single nucleotide polymorphisms (SNPs) developed in previous study. In addition, we performed genetic diversity and population structure analysis to construct the core collection from entire 4,392 collections. there were excluded sample call rates less than 93% and duplicated samples more than 99.9% according to genotype analysis using 180K SNPs from entire collections. Furthermore, we were also excluded natural hybrid resources which Glycine max and Glycine soja are mixed in half through population structure analysis. As a result, we are constructed the core collection of genetic diversity that reflects 99% of the entire collections, including 430 cultivated soybeans (Glycine max) and 386 wild soybeans (Glycine soja). The core collection developed in this study should be to provide useful materials for both soybean breeding programs and genome-wide association studies.

  • PDF