ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Growth and Yield Responses in Maize to Split and Delayed Fertilizer Applications on Sandy Soils Under High Rainfall Regimes)

ผู้เขียน:ดร.ศุภสิทธิ์ สิทธาพานิช, ผู้ช่วยศาสตราจารย์, Viriya Limpinuntana, Banyong Toomsan, Santibhab Panchaban, Richard W Bell

สื่อสิ่งพิมพ์:pdf

Abstract

The yield of maize (Zea mays L.) on sandy soils with high rainfall regimes is generally low due to poor nutrient use efficiency. Split and delayed basal fertilizer applications are possible strategies to improve the crop yield and reduce nutrient loss through leaching in sandy soils, but their effectiveness under high rainfall regimes to produce a maize growth response needs further investigation. The aim of the study was to determine the effect of fertilizer application methods on the growth, yield and agronomic characteristics of maize on a sandy soil with approximately 1,350 mm of rainfall during crop growth. Field experiments were conducted on Oxic Paleustults (Korat series) with a low cation exchange capacity (CEC) of 2–4 cmol kg–1. Three to four split applications of the fertilizer increased the grain yield from 2.7 to 3.3–4.5 Mg ha–1. There was a greater crop growth rate (CGR) and relative growth rate (RGR) with the split applications of fertilizer during 30–60 d after emergence (DAE). The highest agronomic efficiency (AE) resulted from a three-split application. However, application of fertilizer later than 45 DAE had only a low effective rate. Delaying the basal fertilizer application to 7–15 DAE increased the grain yield to 3.5–3.7 Mg ha–1, whereas a pre–planting application produced a yield of 2.7 Mg ha–1. Delaying the basal fertilizer application to 7–15 DAE improved the CGR, RGR and AE. These results indicated that fertilizer applications to minimize nutrient loss increased the growth and nutrient use efficiency of maize on sandy soil in a high rainfall regime.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 044, Issue 6, Nov 10 - Dec 10, Page 991 - 1003 |  PDF |  Page

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Properties, Environment and Fertility Capability of Sandy Soils in Northeast Plateau, Thailand)

ผู้เขียน:นายเอิบ เขียวรื่นรมณ์, ศาสตราจารย์เกียรติคุณ, นางสาวอัญชลี สุทธิประการ, ศาสตราจารย์เกียรติคุณ, พิบูลย์ กังแฮ

สื่อสิ่งพิมพ์:pdf

Abstract

A study on properties, environment and fertility capability of sandy soils in Northeast Plateau, Thailand was carried out using nine soil areas as study sites. Field study included pedon analysis and soil environment observation and sampling of soils for laboratory analysis. Laboratory study consisted of physical, chemical, mineralogical and micromorphological analyses of soil samples by standard methods and soil fertility capability determination using a software computer program. Results of the study revealed that these soils comprise sandy Entisols, sandy Alfisols, sandy Ultisols and coarse-loamy Ultisols on mainly sandy alluvium with generally undulating to flat surface landscape. With the strong influence of sandy parent materials and tropical savanna climate most of the soils even with different profile features show common properties of being acidic, having low natural fertility status and with poor exchange properties. Nevertheless, the soil system still favor cation exchange and their poor fertility can be considered most adversary to crop practices. Fertility capability units of these soils include Sdaekp, Sdhekp and SLdhekp for the upland soils, and Lgaekp and Lghekp for the lowland ones indicating less serious problem for the lowland soils. Major common constraints for their overall fertility capability are their poor exchange properties (e), low available potassium (k) and phosphorus (p). For the upland sandy soils, in addition to their poor fertility status, the soils have low water holding capacity and with rapid infiltration rate (S) making them very susceptible to moisture deficiency. The lowland soils, however, have good moisture regime for paddy rice with a strong potential for denitrification in anaerobic condition of subsoils (g) during cropping season. General recommendations for management of these soils include split application of complete fertilizer, surface organic matter management, low rate liming and monitoring of potassium availability in cropping practices.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 032, Issue 3, Jul 98 - Sep 98, Page 355 - 373 |  PDF |  Page