Ratooning as a management strategy for lodged or drought‐damaged rice crops

Abstract

Rice (Oryza sativa L.) plants have the ability to develop ratoon tillers if the terminal growing point is lost, such as when the panicle has been aborted, matured, or harvested. We examined postharvest and midseason ratooning as management strategies for damaged rice crops, both in irrigated and rainfed conditions. Genotypic variation was observed in terms of postharvest ratoon tillering, midseason ratoon crop growth after lodging, and midseason ratoon crop growth after drought stress. The genotypic variation in postharvest ratoon tillering was related to stem carbohydrate levels at the time of main crop harvest and was affected by soil moisture levels at the time of main crop harvest. Drought‐tolerant varieties did not consistently show improved ratoon crop growth. After lodging, cutting stems at a height of 30 cm produced the highest numbers of ratoon tillers, and the contribution of the ratoon crop to the total harvestable grain yield was highest when the ratoon crop was initiated at earlier growth stages. The highest ratoon grain yields recovered from lodged crops ranged up to 3.58 t ha−1. Total grain yield after drought was improved by trimming the leaves and panicles only in certain conditions and did not appear to be correlated with stem carbohydrate levels. These results suggest that management strategies may be recommended to farmers that exploit the ratooning ability of rice for improved recovery after midseason crop damage.

Difference in Cd accumulation among varieties with different growth duration corresponding to typical agro-climate condition in rice ratooning system

“…The growth of ratoon rice, especially in the ratoon crop, mainly depends on tillering ability and regeneration ability. The stronger the tillering ability, the greater the rice growth ( Torres et al., 2020 ). Study had shown that shortening the vegetative growth stage of rice will affect rice tillering and reduce the rice growth amount.…”

A Case Study from the Overexpression of OsTZF5, Encoding a CCCH Tandem Zinc Finger Protein, in Rice Plants Across Nineteen Yield Trials

“…S18) agree with that hypothesis, but this may equally reflect the necessity of an alternative grain-filling mechanism when drought avoidance traits are not present. Notably, the qDTY donor parent of our pyramiding lines has shown improved drought avoidance traits compared to IR64 (Swamy et al 2013 ; Henry et al 2015 ) and also high stem soluble sugar levels at harvest (Torres et al 2020 ). With these distinct mechanisms of the transgenics and qDTY NIL, we hypothesized that pyramiding of the transgene with qDTY 2.2 and qDTY 4.1 could result in functional complementarity, but that was not observed in the pyramided lines tested which did not show the same degree of drought avoidance as the qDTY donor parent based on canopy temperature (Additional file 2 : Fig.…”

Pengaruh Perlakuan Ratun, Jenis Hanjeli dan Kadar Air terhadap Pertumbuhan Tanaman Hanjeli Jenis Pulut (Coix lacryma-jobi var. ma-yuen) dan Batu (Coix lacryma-jobi var. stenocarpa)

“…Ratuning merupakan praktek budidaya konvensioanal yang membiarkan tanaman tumbuh kembali setelah proses panen selesai. Praktek budidaya ratuning mulai digencarkan kembali untuk mengurangi input budidaya tanaman (Torres et al, 2019). Terdapat beberapa kelemahan dari praktek budidaya tersebut antara lain selain jangkauan serapannya yang terbatas, kedalaman akar biasanya juga dangkal sehingga tanaman mudah roboh dan transisi antara akar lama dan tumbuhnya akar baru rentan merupakan masa rentan terhadap perubahan lingkungan (Hunsigi, 1989…”