Harvest index increase during seed growth of field pea

Harvest index during seed growth has been reported to increase linearly with time for many crop species. Although the rate of harvest index increase was generally stable across experiments within a species, there are indications that it is sensitive to variations in temperature. The objective of the present study was to compare the harvest index increase for field pea (Pisum sativum L.) across 31 experiments that included a wide range of temperature environments. The change in harvest index within each experiment was well described by a linear increase with time but there was considerable variability among experiments. The increase in harvest index was also calculated as a function of thermal time after flowering. The variability was only marginally reduced. Use of thermal time was, however, superior in identifying a common point for the initiation of seed growth among the experiments.

[1]  J. Porter,et al.  Rate of change in harvest index during grain-filling of wheat , 1996, The Journal of Agricultural Science.

[2]  Olivier Turc,et al.  Heat‐Unit‐Based Description of the Reproductive Development of Pea , 1993 .

[3]  R. C. Muchow.  Effect of nitrogen supply on the comparative productivity of maize and sorghum in a semi-arid tropical environment I. Leaf growth and leaf nitrogen , 1988 .

[4]  K. Boote,et al.  Single Leaf Carbon Exchange and Canopy Radiation Use Efficiency of Four Peanut Cultivars1 , 1993 .

[5]  T. Sinclair,et al.  Field Pea Transpiration and Leaf Growth in Response to Soil Water Deficits , 1996 .

[6]  Holger Meinke,et al.  Development and use of a barley crop simulation model to evaluate production management strategies in north-eastern Australia , 1996 .

[7]  M. Bindi,et al.  Analysis of Seed Growth by Linear Increase in Harvest Index , 1999 .

[8]  R. C. Muchow.  Effect of high temperature on the rate and duration of grain growth in field-grown Sorghum bicolor (L.) Moench. , 1990 .

[9]  R. C. Muchow.  Effect of nitrogen supply on the comparative productivity of maize and sorghum in a semi-arid tropical environment III. Grain yield and nitrogen accumulation , 1988 .

[10]  Kenneth J. Boote,et al.  Physiology and Determination of Crop Yield , 1994 .

[11]  T. Sinclair,et al.  Linear Increase in Soybean Harvest Index during Seed-Filling1 , 1985 .

[12]  G. Hammer,et al.  Temperature and Sowing Date Affect the Linear Increase of Sunflower Harvest Index , 1998 .

[13]  D. Egli.  Seed Growth and Development , 1994 .